Back after 7 years, problems when getting head down?

[AMoistOwl]

Took a long break, and now that I'm back I'm finding that apart from being rusty (highest break of 7 today) I noticed that when I go from "Pool" playing, to head down "snooker" playing, my line goes off.
Being left handed I seem to be pushing or moving the cue butt to the left, pointing the cue to the right.

I'm sure it's my hip and stance, but coupled with the back of my straight leg hurting (any tips on that also?) I'm puzzled as to why it happens the further I lean my body or head down.
This could also be part of how I end up scooping the cue a lot and touching the edge of the table with it.

IF you have any tips, I would be hugely appreciative!

[Marfling]

I'm no expert on the intricacies of technique but you could be assuming your pool setup and then from there, lowering (and thus moving everything) to get into the snooker set up. I did something similar when I wanted to get a bit more parallel to the table. Instead of placing the cue online in the right position and taking my body to it, I was setting up in my normal position and then lowering everything, which moved the grip hand and took everything off line.

I took the game up again after ten years or so and was surprised by how much aching there was, in shoulders and legs particularly. I remember my bridge hand cramping as well which was weird! You could try turning your straight leg out a little to relieve the strain. Maybe some hamstring stretching as well?

[vmax]

Place a red on the side cushion (yellow side of the table) with the centre of the red exactly on the baulk line, place cue ball on the yellow spot and practise taking your stance and getting down to strike the red full ball. Take your pool stance addressing centre cue ball and check the position of the cue in regards to the baulk line, adjust feet position if it's a bit out, then do the same with your chin on cue snooker stance.
There's probably a difference between the two that happens when you lower yourself into position for chin on cue, especially if you're taller than average.