The solution is even more simple than that.
Your VPX is most likely handling your trim functions, all you need to do is connect your laptop to the VPX and open up the configuration program.
On the roll trim page, at the bottom it shows current position.
Once you are happy with what you consider zero trim, simply type that number into the "neutral point" box above and select update.
You can even move it L/R directly from the screen.
When installing that trim, you have to be perfect at marking center and then marking your spring mounts.
Anything off center even the slightest can move those ailerons.
Lloyd