Please could somebody help me work out how to get the most out of my R9 380s.

I used to mine ZEC using a GTX950 and got 165 sol/s. I then bought an R9 380 and with using the Claymore Zcash AMD GPU miner I got an extra 210 sol/s. I then bought a second R9 380 and swapped out the GTX950.
Initially I was getting 210 sol/s on each card but my mining pool report said I was hashing at 0 sol/s. I left it for a few hours and still nothing, despite the miner seeming to be working OK.

I restarted the miner and now I get 175 sol/s from one card and 20 sol/s from the other. I dont understand whats happening. Do I need to run two instances of the miner or change some settings? I have played with the intensity. I havent put it above 6 yet but if I lower the intensity the hash rate goes down.

Please help! I was hoping to mine at over 400 sol/s but at the moment i'm getting 200 sol/s from two R9 380s!