in the world of wooden model prop's a couple ounces is quite a lot of wood, I would hope one wouldn't need to remove much more than a gram or 2,,,

I had a Zinger 20 incher that needed a lot of sanding on 1 blade's trailing-edge, once balanced and on the motor I could tell that it didn't produce an even amount thrust, it produced what I would say were pulses of thrust, when I replaced it with another Zinger that was balanced with glue added to 1 tip I had a prop that produced a more even thrust of air,,,

measuring the first prop's blades did show a difference in the blade's widths, so the widest blade was producing more thrust than the other,,,

so now for balancing I will add clear poly, and or paint the tips and then add more paint to balance the light blade...

Jim