My advice is to start 'simple' :
try putting weight to the back on starboard side (right side)
If this allready solves the issue, then put your rigging weight (battery, signal flags, ropes,...) to starboard side and you're set.
I had a ring16 in the past with a 140hp evinrude. Insane boat and hard to handle, but a lot of fun.
good luck !