I want to make it quick about future developments of BTC and BCH for reference:

BTC core: Segwit, LN, Mast, Tumblebit, Roostock, Schnorr sigs...
BCH: 8MB block, 8MB block, 8MB block, 8 MB block....

I would not support BCH for its Chinese behind. So what's your choice?

Yeah I would not call it decentralized with that much premine.

They just announced "Public mining will be available at block height 499407", so what's current block? I feel like BTG dev teams are not professional.

It looks like pool.gold is down while cannot login to btg.suprnova.cc as well. Are there any suggestion?

4.5 sol/s is amazing at your setting with 60% power limit. The maximum efficiency I could achieved at 75-80% PL which I usually use is not that high, around 3.3 sol/s, but I think it's acceptable.

The truly privacy coin, it should be Monero. Actually, XMR is the most anon, untraceable and fungible cryptocoin in existence. It has long way to achieve an ideal of  "complete anonymity".
I also like Zcash in somehow but I'm afraid of its trusted setup.

I think you're right on calculation. But market is smart, it knows how to regulate it.
For me, I will mine it about 1 week even when its profit is low.

Flypool also downed as well. When I checked the recent mined blocks for ZEC, most recent blocks are mined by 1 guy Coinotron.
https://explorer.zcha.in/blocks

For CPU mining, I prefer Monero (XMR) and Magi coin (XMG).

Suprnova is a big pool but I'm curious that why BTG website doesnt list suprnova in pools category.

Coinomi already added Bitcoin Gold. I'm also going to use it for mining as well.

You could try Bitcoin Gold, it is expected to be mined next week.
Actually, I think many people are waiting for mining it even most of us think it's scam.

I use several wallets: Exodus, Myetherwallet in PC and Coinomi for mobile, also Leder nano S for cold storage.

Pool.Gold announces "BTG official network is expected to start on Nov 12 2017, 7 PM UTC".

After few days of running, some of my rigs have the same problem on low hashrate and high temperature of GPU4 (1070 card with only ~215sol/s).

Nice setup! Could you please share more about the ventilation and cooling plan!

They announced that Novaexchange will have new owner. For me Novaexchange is good, so I dont understand why they sell the site. But hope when it backs, it will be better.

Your rig is rack mount case or open air frame?

Normally I put PSU in place which is easy for connecting cables to all GPUs and risers.
Another note is PSU's fan side should direct to outer of rig because in some case if the loading is high, the hot air from PSU should not flow to MB or GPUs.

For proof of capacity (PoC) such as Burst coin or Storj coin, few hundred Gb even 1Tb is not worth for mining. Also, using laptop for mining is not good idea I think.
If you are really interested in PoC mining, I suggest you purchase some HDD (total should be >15Tb), but actually the ROI for PoC mining now could be 2 years or even longer.

Maybe this site is a good option for rare altcoins which I'm trading in Novaexchange. Especially, Novaexchange is going to close in next April.