Well, facing the same issues as you! Got any insights to resolve this issue?
Moreover, the Slack invite also says the limit is reached.

The similar thing happened to me too.
I deposited 646 BIS into HEAT wallet and they deposited perfectly fine into my HEAT account.
I tried exchanging them for HEAT and when I used HEAT exchange, the transaction never broadcast nor announced on the block and the BIS balance was 0.
After a few hours or so balance did come back and I tried withdrawing my BIS back to my local wallet. I initiated a transaction to transfer my BIS and again the same problem as above.
Now balance is zero, have to wait a few hours or so until it comes back and no way to broadcast a transaction what-so-ever. Any advice?

For the default settings, 18 MH/s seems fine.
Now, to reach higher values you have to tweak some settings and you can have around 29-30 MH/s.
Bios Mod your driver according to your GPU company (Sapphire, Asus, MSI, etc.)  and memory Vendor (Samsung, Hynix, Micron, etc.)
Undervolt your core, Overclock your memory, use -dcri 6 when single mining and -dcri 30 when dual (claymore command line bat) for best hashrates.

Did you update your drivers to The Blockchain drivers released by AMD to fix the DAG issue which reduces the hashrate as the epoch goes to a higher number?
DDU the previous driver, Install Blockchain driver, Patch Driver and you should get your old hashrate back.
HERE: https://support.amd.com/en-us/kb-articles/Pages/Radeon-Software-Crimson-ReLive-Edition-Beta-for-Blockchain-Compute-Release-Notes.aspx

When you boot up your system for the first time, the GPU will be displayed as Microsoft Basic Display Adapter.
This will indicate that the system has recognized the GPU plugged in the system and after you install the dedicated driver for that GPU, It'll display as RX 580 in Device Manager.

You don't actually need to, just enter the number of units you have of a particular GPU in the website and it will input the value of the hashrate of a particular algorithm by itself. Then you can run it and check for the most profitable coin.

Well, it varies with the pool. I used to mine DCR with the pool which charged 0.1 DCR for withdrawal to your DCR wallet, so I switched to another pool where tx_fees were less.

Well, if you are interested in Litecoin and Ethereum, then Litecoin seems a good option as of now to get started with mining.
Ethereum will switch to complete POS consensus by the end of next year, and building a mining rig for ETH will cost around $3000.
Whereas, Litecoin can be mined by an ASIC that you can get for around $1500 or so and start mining immediately as soon as you receive it.

You're getting the correct amount of DCR from the mining pool.
Payment Threshold: 0.1 DCR
Transaction Fees for DCR is normally 0.005 DCR
So, 0.1 - 0.005 = 0.095 DCR and that is what you're receiving in your wallet once it reaches the threshold amount.
You forgot to take Transaction Fees into consideration and that is where your missing DCR is going.
Reddit Thread for more info: https://www.reddit.com/r/decred/comments/6qb5ts/are_standard_tx_fees_really_as_high_as_01_dcr_or/

I assume you have updated your BIOS to the latest version and made necessary changes such as changing the lane speed of X1 and X16 slots to GEN1?

Here is the link to the same:
http://windowsiso.net/windows-10-iso/windows-10-creators-update-1709-download-build-16299-15/windows-10-fall-creators-update-1709-iso-download/

Well, it is already 0.004 right now and I don't think it will stop until it hits 0.005-0.006.
This can be a coin worth being in TOP-20 in foreseeable future.

It doesn't matter where you place the syntax "-di"
For example:
The above will enable GPUs which are located at index 0,1,2 and 3.

You can try this website: www.whattomine.com
I'll suggest doing a benchmark of all the algorithms to get their respective hashrates, put the numbers on the website and you can get the most profitable coin to mine.

At the moment, you can only run 10 GPUs in one claymore instance. So, if you have 13 GPUs claymore will only mine with the first ten GPUs.
The solution being splitting AMD and Nvidia cards separately in two different batch files and running both the instances together.
Using -di option, specify the AMD GPUs index in one bat and specify the Nvidia GPUs index in another.

Bitsend is based on XEVAN algorithm for its POW consensus.
So, going with Nvidia GPUs will be a better choice rather than picking AMD for it.
Because the support of miner for this algorithm is better for Nvidia rather than AMD
You can go with any Nvidia GPU 10th GEN such as GTX 10xx series.
Use ccminer to mine Bitsend with Nvidia GPUs.

GPU rigs are quite bulky and there are too many wire connections between them, so they are far from small form factor mining hardware.
ASICs, they are compact, power plug and ethernet connection only. Baikal miner is one compact ASIC miner.

Speculation will differ from person to person.
No one can tell if BTG will reach the moon or MONA. It's for you to decide which one to hold.
For mining, MONA seems to provide double the profit at the moment.
Link: GTX 1070 Profit

What is the model of your GPUs?
You can say that both of your GPUs were working in crossfire (AMD) or Nvidia-SLI (Nvidia) and as soon as you updated to new drivers, something went wrong and both of them stopped working.

You can easily buy some Scrypt hash-power from nicehash and use it for your development testing.