I am no expert, but I play one on the internet. Looks to me like you have your bow arm locked. I see some collapse on shots. I can't see your alignment for sure with the shot angles, but looks like maybe your string arm is not getting back all the way in line and your follow-through is often not a natural reaction due to back tension, but more of a after thought. I don't think your arrow and shoulders are square.
Could be that 10# jump in weight is not helping.
Grip makes a big difference for me on how the arrow reacts for spine. Different rotations can shift where the arrow hits the riser. I also see a difference in spine shooting three under. You could be stiff with your changes and getting stiff mixed with false weak giving you the variations.
I also like that tucked finger grip for consistency, but find the grip ends up messing up the cuticles on my finger nails after a while with the rubbing.