if you don`t see multiple see tcp connections, then it does not open multiple connections.
I dont use dstm so cannot verify.

Equihash algo mostly past weeks. that would be zcash, zencash, hush, zcl, etc.
Sometimes ethereum - dagerhashimoto based algos (rarely lately), sometimes cryptonight algo (rarely lately), sometimes lux (phi1612 algo)  (not that often lately) and used to to bitcore too.
cryptonight algos were nice a month/two ago, decent hash , lower electricity cost, lower gpu temperatures but recently its crappy.

Just don't use ebay for items like this.
Probably there would be plenty of people here who would buy it if the price is reasonable.

Seems good.
My electricity is expensI've, so same cards latest settings are on 65 watts, 150 core 350 mem gets me around 255 sols. Big factor is temperature too. Mine is 48-50c.
If I drop temp to 45 I get small boost in sols but I hate the noise of fans so settled for 50c and 55% fans.
I do eth sometimes , it's about 18.5 mh but crappy hynix.

You could try down volt mem and core, from bios edit.
It would drop hashrate a bit probably but would also drop your power

Yes it's normal.
More competition bigger network hashrate, less money for you.

There isn't one in the Aug beta blockchain drivers. Don't worry.

Also you can try ethminer miner app. Free one.
Skip the claymore totally if you mine only ethereum. And skip fees.

Unfortunately if you expect a steady solid horizontal line for the hashrate, it won't happen.  Too many variables, flexible hashrate, flexible difficulty based on hashrate, too low hashrate for you, etc.  
You can try another pool see if you get more, but I would not expect a fixed line and fixed amount of ETH per day. It  move up and down with certain %, nothing is static.
And if you use whattomine to calculate , that is misleading as well.

Its probably worth it only if you have PCIE slots and put few GPUS in parallel in the same machine.
As a supplemental mining

This one will go back to below 300 in a month or so.

27 - 30  depending on your lucky number.

for you - no negative impact.  Especially if the GPUs are the same type/model.
for the pool - a bit more resource usage.

p.s.
And that is if it really opens 12 connections.
Easy to verify - netstat.

If its only 2-3% increase, that is not big difference at all  
you can get that (hash vs watt vs sol) from the miner with tweaking the cards better.

Dual mini is pretty much dead for me.

There are a few topics on that one. It is where it should be.
The Dec and Jan hyper prices were not real. Cause was the bitcoin manipulations.

1 april.

They will produce as much as they project they can sell, no matter mining or not.
They earn on sold cards. Their profit is approx 2x on the cost for manufacture + the usual  other expenses r&d, etc.

Memory seems the bottleneck last years because nowadays it's used everywhere.

If u want to cash the bitcoin on daily basis  yes. Probably.
Otherwise if you keep your mined coins not using nicehak, after few months you would have more on the day. Got the idea?

 And btw you have nothing until you cash out. Zero profit.

1030s are back in Stock,
Go get them boys and girls 

It's called Gaming market for the gpu companies. Its more than 200 million gamers.
The fact people can mine is coincidence.