You have to edit the dcri value to try to find a stable setting in V9.0. While in runtime you can you + and - to change it, find stable values for each of your cards, and then set it in the batch file.
Tried - to change it going little by little but even when I reached the same speed I had in 8.1v it still gives me invalid shares to the point the pool disconnects, no idea if it is because of my custom bios, 173 MH/s ETH and 2603 Mh/s DCR on 9.0V 173 Mh/s ETH and 4812 Mh/s DCR (without modding) currently at 2600 Mh/s but 50/50 accepted and invalid share ratio so pool disconnects
use -asm 0
Here is my bat file
./ethdcrminer64 -epool us1.ethermine.org:4444 -ewal 0x95232B0E1a2dcE5AeDaA001C1135425afa2f306B.Eg1 -epsw x -gser 2 -wd 0 -tt 66 -fanmin 60 -dpool stratum+tcp://dcr.pool.mn:2255 -dwal hzavarce.eg1 -dpsw x -allpools 1
Tried -asm 0 but still same problem with bad DCR shares, I have 6 RX480 Sapphire with modded Bios
With 8.1v on Ubuntu 16.04 (Log from yesterday)
12:56:59:940 8d7fa700 ETH - Total Speed: 161.061 Mh/s, Total Shares: 64, Rejected: 0, Time: 00:29
12:56:59:940 8d7fa700 ETH: GPU0 26.821 Mh/s, GPU1 26.889 Mh/s, GPU2 26.802 Mh/s, GPU3 26.874 Mh/s, GPU4 26.855 Mh/s, GPU5 26.821 Mh/s
12:56:59:940 8d7fa700 DCR - Total Speed: 2415.912 Mh/s, Total Shares: 136, Rejected: 1
12:56:59:940 8d7fa700 DCR: GPU0 402.321 Mh/s, GPU1 403.329 Mh/s, GPU2 402.027 Mh/s, GPU3 403.105 Mh/s, GPU4 402.819 Mh/s, GPU5 402.311 Mh/s
If I only mine ETH I get 29.2 Mh/s