No disrespect but I cannot believe this!

I have a GP magnetic prop balancer and I check every prop I use.

Zingers are pretty good but they do need to be balanced. The pack of TF power points I got from TH needed so much work I'm not sure I'll bother with them again.

People say that MAS shouldn't need to be balanced, I don't have any 2 blade paint stirrers hanging around so I can't comment.

I do, however, have a MAS 3-blade 8x6 which definitely looks like it has a heavy blade, but I'm not sure how to go about balancing a 3-blade.

For wood 2 blades I usually just sand the end of the heavy blade until the prop balances level, but there are articles which have been written on this subject that go into great detail about determining exactly which part of the prop blade is heavy and making adjustments in the appropriate place.