from what I can see and my experience, youre basically just losing your balance forward a bit, which isn't too surprising with the elevated heel and your squat style. You squat fairly wide, sit back a lot into the squat, and it looks like you have a fairly low bar placement. Oly shoes tend to help lifters out who have a higher bar squat - lifters who sit down more than back, push the knees forward rather than trying to keep the shins vertical, and who have a higher bar placement. The oly shoes are great for when you are squatting with a very upright posture.
The thing is, depending on how recently you switched, you might not really need to change anything - it makes sense that, you elevate your heel when you're not used to it, it is going to put you a little off-balance. If it's only been a couple squat sessions, you probably will just get used to the change and it'll work itself out. But if it seems like it's not going away, I would suggest maybe a slightly higher bar position, real attention to keeping your chest up, and maybe even trying to sit your hips straight down/push your knees forward a little bit. Those changes might make your squat a little more upright, which might feel better with the oly shoes.
Or, you could do what mike t. does and go to a cobbler and get the heels trimmed off your oly shoes haha. But I think new chucks might be cheaper than that.
Anyways, that's what I would guess it is. Maybe other people will have more insight