Replying to BOOT PROBLEMS

So I’m new to the world of skiing. Got into park last season(been skiing 3 seasons), and I’m just having so many boot issues. Now that I’m getting more comfortable and throwing bigger tricks, I just fucking hate when my foot moves at all. I’ve sized down from a 26.5 Nordica(so much shin bang). To a 25.5 k2 revolver. Which fit soooooo good at first. Now I’ve packed out the liners and I am CRANKING those jawns tight to keep my foot feeling secure. And it makes them not flex correctly and I have to unbuckle on the lift and constantly adjust throughout the day. They are definitely the right size. So is this something I need to get used to??? I work in a reputable ski shop and my boot fitter keeps just recommending shims and heels lifts which I use. Or a 98 last boot which I don’t really want as there’s no 3 piece wrap liner models which I’ve loved so far.