@Ajaycee
For me, the game changer was to start doing the jazz swing with my weak hand. Not the jazz swing itself, but the things I started becoming aware of while practicing it.
This is something I started doing just a few weeks ago; not just on the ride cymbal, I've actually done very little of that; but mostly just sitting with a drum stick in my weak hand while in front of the tv. Doing the jazz swing into thin air, or singles/doubles/Moeller against my thigh or a pillow. And also on the practice pad.
I think the real hinder to overcome for me was about the strength in my fingers. Thumb, as well middle- and ring finger. Particularly the latter. I needed to 'program' my weak hand to do the same as my strong hand, as well as strengthening the fingers. And I've done that though very deliberate and slow movements, going back to basic, like it was day 1 of learning. Programming the brain and strengthening the fingers through repetitions.
It's far from the first time I've taken measures to get my weak hand up to speed. But this is the first time I've done something that has paid off big time, and quickly. And it's probably the first time I've taken the right steps, focusing on the correct things. Instead of just trying to mirror the hands while practicing on a pad, which is what I've done before and hasn't really worked for me, I now went deeper into the mechanics, focusing more on the weak hand in isolation.
I struggled with the same as you, that the area of the drum/pad I'd hit with my weak hand would fluctuate seemingly randomly. And it's probably because my fingers were too weak to control the stick properly. I see a marked improvement now, and have so much more control over my weak hand fulcrum, as well as the power I generate.
Btw I play matched grip. Not the French version, just dribbling the basketball with both hands.