Trimming Help

[Paul Lawrence]

After getting soundly beat in Ocala last weekend, I realized that I have been getting proverse yaw as my plane rolls.
It wasn't evident until I saw other well-trimmed planes flying.
The plane yaws in the direction of roll input and I have been experimenting with a multitude of aileron differential settings and can't seem to remove the yaw.
With zero differential, the plane still yaws in the direction of roll. 
The trimming chart says to reduce differential in this condition, but I have reduced it to zero.
Should I program in negative differential(doesn't sound good) or should I program a litle bit of opposite rudder correction to offset the proverse yaw?

Also, does CG and Incidence affect adverse or proverse yaw while rolling?
The plane was a little nose heavy and I have also been adding tail weight to try and clean up the rolls, but still can't get that yaw out of the rolls.
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