Could I suggest something to try?
Using what ever back strap you have on the pistol..
Raise it up, just as you would to fire it (make sure it's empty first) and put the sights on the target, with the target straight in front of you. Do the sights line up with each other on the target without you having to search for that front sight and align it?
Next, raise it up as you would to fire it (still empty) and put the sights on the target, but a target off to the left, or right (45 degrees or so), try ground level, too. Do the sights line up with each other on the target without you having to search for the front sight and align it?
I ran into this with my M&Ps. I first tried out all the back straps till I found the one that felt best in my hand. Then, one day while dry firing, I noticed that if I brought the pistol up, aimed it just about anywhere but straight in front of me, I had to hunt for the front sight. The pistol did no point "naturally" for me. Straight ahead and level (like at the range), it's fine. In a self defense situation, the target might not be straight ahead and level and I didn't feel I would have time to "find" that front sight.
It's all in how it fits your hand I suppose. A muscle memory thing with alignment. But, why have the pistol set up so that your grip, or the way your point the pistol has to be different based on target location/angle/elevation? I want mine to be the same every time. The 1911 does that for me. The M&Ps after I put the right back strap into them. My P07 and P09 do that (old DUTY P07 and P09 with the medium back strap).