without seeing your feet it is a little difficult to say exactly what the best solution is
how many days have you had skiing in the boot, if over 100 then the liner is probably well packed out just through wear rather than being the wrong thing in the first place, if you have only had 20-30 days or similar then the 97mm would almost certainly have been the better bet
adding an intuition liner or other custom liners will take up a bit of volume, they will however (over time) pack out just like the stock liner although mostly they take a little longer to get compressed
one thing you could try before spending money on either liners or new boots is a simple volume reducer shim, have a chat with your boot fitter, these are normally 1.5-3mm thick shims made from either compressed cardboard (bontex) or a high density EVA foam, they are inserted in the bottom of the boot to take up just a little height/width, the net result is that they tighten the boot all over the foot area.
good luck whatever route you take