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 was 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