So to be about 1.5 moa right at 600 yards, you're in the ballpark of 3-5mph wind depending on bullet/velocity..sometimes the wind can be doing things that are so slight closer to target and not necessarily at shooting position. You're less than a minute high which isn't ideal but could definitely be a slight variation in MV/BC. Seems like it's less of an issue than perceived to me. Sometimes that wind can feel straight on or from straight behind and actually have some angle to it down range and could easily cause this sort of miss, I've even shot in some weird switchy updraft situations that threw me off more then that vertically as well!