Ok, the front sight is 5.5mm I'll admit I wasn't using precision measuring instruments to measure but that is beside the point. The point I was trying to make is that the #4, #5, and #6 night sights for the cz75 from the cz store all have the same height front sight and that the elevation is adjusted by using different sizes of rear sight. #4 being the shortest which translates to #4 having the lowest POI, which is still shooting high on my P07.
If #5 meps work for you, great. The fact is they won't work for me and I am simply passing that info on.
By the way, have you grouped yours at 15 yards or farther? Do you use a 6 O'clock hold? What is the diameter of the targets you shoot? There are a lot of factors to consider. Simply saying "you're wrong" is ignorant.