Had a GREAT shooting day this afternoon. NO wind for a change. Was shooting my 22 Wildcat with a 6x24 Vortex. 25 Wildcat and my Boss both with Hawke Sidewinder 8x32 and a 177 FWB with a 4x12 Vortex. What I noticed was that when I got above about 3/4 power my POI would start to suffer. Not much, but noticeable. Everything is the same except for the power level. Im at a loss to explain it. any ideas?