Replying to Ankle weight effect

I recently bought some Kartel 108's in 191cm to use on softer days instead of my Kartel 98's. The 108's are absolute bomber skis and they are incredible in every condition. I have been skiing them a lot lately.

But I recently went back to my Kartel 98's and they felt completely different than I remember. Kept landing backseat and feeling squirrely on groomers. I feel like I am overpowering them now. Is this just like the placebo effect or will I never feel good on smaller skis again? How do you guys ride different sized skis on a regular basis comfortably?