Holger,
Can I ask what kind of rear sight you're running? The only reason I ask, is because I'm curious why you'd want to go with a higher front sight than OEM?
I find that the CZ 75 SP-01 series (Shadow, Shadowline, etc..) are POA/ POI as opposed to the "Lollipop effect" that I find out of my M&P's ... If you understand what I mean?
I actually went with a lower front sight to raise my POI for factory 124gr bullets, because I found that the OEM front blade sight kept "grouping" low.