I too am perplexed by what a "false tune" is. I tune all my rests by group tuning and bare shaft tuning (for spine). I do the same with the W.B. and can't think of a single reason why it appears to give me great results, but that it may be "false". When I done tuning, I get great groups at 20, 40 and 60 yards. Broadhead flight is great. It appears to be no more difficult to tune or to check the tune then any other rest I've ever tuned. How do I detect a "false" tune?