So. Some thoughts on how to adjust for the shorter barrel length and back heavy grip.That could explain some handling differences. I think the FC is the one with the beefier full sized frame that allows you to get the 4.5F's ammo capacity, but also has the shorter compact model's 4" barrel. So the frame could feel a bit oversized for the gun compared to the average compact handgun. Have you tried switching in the smaller sized backstrap? I found that helped alot for me and my short sausage fingers. They dont look very different, but those small changes do make a difference in comfort.
Low cost option: If you still have the picatinny mount for a dot sight that you didn't need thanks to the VIS, you could mount that on the underbarrel rail and attach a fitted piece of material to add some weight to the front end of the barrel. That should help with barrel flip a bit. The flashlight mounted on one of the guns in the earlier photos could fit the bill.
You could get a threaded barrel and attach a muzzle break. It would make the gun feel closer to a proper full size. Or, if you have the budget for it, you could replace the barrel and slide with the compensated versions.
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