Ok so you are using a pool? i was just thinking something that didn't use as many watts and or one that does good mining but more used. Do you have a fan problem with your? I did see a gridseed but i guess they would be ok to begin with.
I used to be in pool mining but I switch to another coin that I could solo mine.So I put up a local pool and solo mine the coins with my 2 s5's and 2 s7's.
I do have some fan issues but nothing that causes the miners any harm on the s7's The logs just say it cant control the speed of one fan but it is still cooling just fine. You can find some good equipment for 200 bucks just need to watch for people selling it. It goes quick. Every one know on here what the prices should be and some of the long time users sell there used equipment fairly priced. Just have to watch for it.