How to solve audio sync issue on the Mac? (and it is not just by a constant out of sync amount)
I made a workaround which works for short clips: at around 5:00 i split audio and resync second part (drag it backwards by around 0.4s so that is overlaps a little with 1st part). If clip is longer than 10 min I repeat operation at around 10:00; split audio again and resync 3rd part, and so on. 

You can do it also for longer clips but it gets more and more tedious