tonyL1,

It is not uncommon to have one wing tip heavier than the other.

I would recommend that you wait until the plane is finished before you balance the wing. You want to put the wing on the fuse with all the gear and engine mounted, then laterally balance by removing weight from the heavy side (as you have been doing), or add weight to the light side as a last resort.

This takes into account all parts of the plane as it is set up for flight.