Again,, searching on the forum for "tip weight" will give you a weeks worth of reading,,
MY method to bench trim is to set the airplane up as it will fly,, level wings, put my scale under the outboard tip, add lead till that wingtip "weighs" between 1.25 and 1.5 ounces,,
then flight testing will give info for further adjusting.
It may be a real benefit for you to search using something like "trim chart Paul Walker " which should net you a plethora of info on how to trim and why,,
Good luck,
have fun,, the research is almost as much fun as building and flying,,
well for me anyway,, but I am a bit ,, different LOL