Did you test and benchmark your cards before making any of the adjustments/mods you made?
One thing I ran I to this week with my first rig wad changing the cards from graphics to compute in the and settings. I was only getting 17 MH out of my cards then went up to 24.7 after that. I have 570's.
Also sometimes you need to go back and start from scratch and change things one at a time to monitor the results you get.
Sidenote you are in the bitcoin section, I've reported to mods and they will move it to altcoins
Good luck
out of the box I got something like 17mH/s in gaming mode, at that stage I didnt even know about computing mode. I would like to get back from the very begining but basically I am running same way, thats why I would love to see some modded computing bioses from same model to verify differences.