Ah, I now see the alignment issue you’re describing. I had a similar problem with my mantlet-to-turret alignment in that my barrel looked like it was always in the “high salute” position. My solution was to trim the elevation tabs/trunnions and slightly enlarge the screw holes in the tabs, then fiddle with their alignment front/back, up/down until everything was even and level. I then very carefully removed the mantlet, marked the positions of the tabs/trunnions, and then secured them with a spot of CA glue to supplement the screw. It wasn’t fast or easy, and it took a bit of luck, but in the end I think the time fiddling with trimming and repositioning paid off. I wish I had an easier and quicker way to do this, but I was experimenting quite a bit as I went along.