Beware! very picky about the picatinny rail - Holosun HM3XT Magnifier

I have not yet been the range with this magnifier, however once mounted it looks like it should work well. However I did encounter problems attempting to mount the optic.

Issue #1
Attempting to mount it on a obscure produced Side Charging Upper, the optic mount would not clip onto the upper Pic Rail. After trial fitting on numerous uppers and bolt on Pic Rails, I determined that not all Pic Rails are created equal. It would mount up easily on my Springfield Saint Victor & numerous Aero Research uppers. But not the fore mentioned Side Charger and several aftermarket bolt on accessory Pic Rails. After measuring everything I determined that the items which wouldn't accept the optic mount had slots on the Pic Rails that were slightly too narrow. The Optic Mount has two located lugs that are supposed to register in the Pic Rail. I'm guessing Holosun felt they were necessary due to the weight of the optic. I ended up opening the slots slightly on the upper to accept the mount. If I had it to do over, I would take a little off the optic mount lugs.

Issue #2
I am pairing this Magnifier up with a Holosun HS510C Red Dot. The QD lever of the HS510C is on the right side of the mount, on magnifier mount the lever is on the left. The apparent result is that the two optics do not mount up exactly in parallel. I had to run the "windage" adjustment of the magnifier all the way to the end of it's travel on one side to get the reticle near the center of the magnifier. It appears to me that the to products were designed by two different teams, without real thought as to how they were going to be used. I can't complain about the tight tolerances on the pic rail mount. But why the two optics are not biased to the same side of the rail is just poor (or no) planning.