I think you just need to fly the plane and get used to it first. In the end how it feels in flight should determine the optimum balance point and not a measurement (that only gets you started) If you are interested in precision flying and have a computer radio IMO the best way is to mix in elevator with throttle this will not only keep it from balooning on landings but will also keep it from pulling on down lines. You want to mix in enough elevator so that when you do a power off dive in no wind or cross wind the plane goes straight down and doesn't pull out. Checking all the incedences is a good thing also. It could be for some reason the engine has down thrust or maybe your ailerons are not quit centered. Also check the full power vertical uplines it should go straight up and not pull or push if it does that would tend to indicate engine thrust line problems up or down. Also if you have the flap/aileron mix on you can make minor (not more than two clicks) trim adjustments by raising or lowering both ailerons and see if things improve when you change the aileron trim you will have to re-trim the elevator.
Trying to make the ailerons act like spoilers IMO is not a good idea.

It would take me 10-20 flights to get used to a plane and get it tuned.