If you mined straight ETH you should be making $300 a day.  With my 4 x 1070 ti &  2 x 1070 rig pointed at one multi-algo pool constantly I average $40 a day.  Twenty rigs that would be $800, hmm now I want to build more rigs.

If I had 20 rigs I would experiment with a couple of them. Use the pools mentioned above and point one at each, zpool, mph, etc. and mine each one for a couple of days without switching and see what you get.  You might even assign one to Awesome Miner to switch on pools to see how it works.  Once you run all these tests then if one is better than what you are getting now then the decision to switch the others is easy.

Cheers!