I tried running the ccminer x64 for equihash, and the max gpu load was 90-91%. Is it not really compatible yet, or I need to add some tweaks into the .bat file?
Ccminer is unoptimized for Equihash.
Try the switch ............. -t 2 ...... if you have 1 card
or multiply by 2 with the total number of cards in your rig.... to have double thread ..... like .... -t 8.... for a rig with 4 gpu.
Most likely all the miners are using this approach inside.....