The only pool you should avoid is Nanopool, it produces twice as many stales compared to other pools, just don't report them. You shouldn't worry about stales on Ethermine, it is completely normal for a network with 15s block time to produce a noticeable amount of stale shares. You're getting paid anyway, just on a slightly lower rate.
As long as they pay stale shares, ethermine pays 60% and so nanopool.
A doubt, I have several rigs with 8 GPU's, is it possible for example, for 6 GPU's to mine for a wallet and the other 2 GPU's for a different one at the same time?
We can't stop blaming you, everyone needs to know the truth ! Compared to some other pools you are stealing arround 50% of the income ( if it's server issues or whatever else it's just your problem, but as long other pools can credit 100%, it's just stealing ). You can ask for a higher fee, set pool user limit, etc, don't just let ppl think they will earn X ammount of coins based on their hashpower and you pay like 50%. With all the mising coins in like 1 week, and with the hashpower from blake2s-unimining, you could earn like thousands of $$, please play fair.
Thanks.
There is no point telling a thief not to steal, the best thing is competition, if we get a good pool that pays honestly then those thieves will have to change their way cause if not then nobody will be mining in their pool.
unimining.net is ofcourse stealing miners, i recieve half of income with the same hashrate