ankle moving in ski boots

Hello guys
I am a man, 28 years, 93kg and my problem is that I have very thiny ankle and even when I buckle up my ski boots to the max and when I lean forward and press the front tongue of the boot I fell my heel moving up a little(and my foot as well). So a frend of mine told me to consider buying a footbeds. Would that help me or are there any other sollutions to the problem.
Otherwise my boots size are just right, so this is not the cause, I just have thiny ankles and calves

Ski boots come in different widths. The variation between manufacturers offers further choice, as one brand might have a larger toe box, or another a narrower ankle, or heel pocket. It does sound like your boots are a little large for you. An off the shelf footbed may help as these often have a little heel lift built in. There are also adhesive foam pads that can be positioned on the outside of the liner, around the heel.

Believe me I went to all the brands and I have tried maybe more than 20 boots and the ones I buyed (Salomon Impact CS100) were one of the few that fitted comfortably to my legs. But in the shop you can not feel the same as in the mountain so I discovered that my feet are moving a little and I'm looking for a solution now.
And these footbeds, where is their place? Between the shell and the ski sock or in the sock?

What about these one http://www.superfeet.com/en-us/insoles-and-sandals/redhot They have high heel

The super feet are worth a try. With your foot better supported, you may find there is even more room though.
Did you shell test the boot? http://www.youtube.com/watch?v=BK0h_4VJdoA

I haven't done it in the shop but I did it just right now and everything seems right like in the video. Even the ankle bone width is less.
I also just tried my silicone insoles for my everyday shoes and actually I feel better. But they have only arch support, the heel is not lifted. So I thing with the superfeets will be even better.
And one question. Where should I place the insoles - in or under the linear. And should I remove the stock pad which is 2-3mm high?

Choose a superfeet footbed size that best matches the contours of your foot (not necessarily you normal size) . Use the stock innersole as a template to cut the supperfeet to fit your boot. You may still need extra padding around the ankle... http://bootfittingsupply.com/#!/~/category/id=2374229&offset=0&sort=normal.