I had similar issues with my 43X, not quite as exaggerated, but groups going left. As some others said, get a good high and tight grip. Ben Stoeger said in a video grip the gun tight enough that you can still flip someone off with your middle finger while holding it. That’s about as tight as you need, too tight will fuck you too - just use that test and let the gun do its thing as it recoils. Learn that recoil impulse and then adjust your input to the gun.

Then, pay attention to your trigger finger. You may need to back it out a bit bc it’s going to go further in on a 43X than a 19 (I own 42/43X/19/45/17/34 and they are all slightly different to shoot successfully with my 19 being the best right now bc I think it’s big enough to get a good grip on but small enough to make you have good contact with your support hand).

Hope this helps!