Well that kind of goes card to card... With my 1070's I am running them on Afterburner at
-75 Power Limit
+200 Core Clock
+500 Memory Clock
65% Fan

Using Claymore Dual Miner 9.x I get
I get 28.5 Eth and 287 Dcr  (Total $2.53/day) per card

Using EBWF Zec
I get 430 on Zcash (Total $2.64/day) per card

I had the same problem on EBWF.  You will have to play around to find what keeps it stable.  
Also added a few lines to my command prompt to auto restart the miner if the cards crashed it...
:startminer
miner --server eu1-zcash.flypool.org --port 3333 --user t1gwf3idxiH8LwAuJs4vRmkVWpaL719iRFQ.Leoben --pass x --cuda_devices 1 --eexit 3
GOTO startminer

Made one Bat file for each card by changing the "--cuda devices x" command and ran them all individually to see what one was causing it to crash.  
I then tweaked that card individually until it stayed stable then synced all the cards to that cards setting.