Replying to Lange RX 100 as a park boot?

So I work at a ski shop in my town and we just had the Lange rep in last night. I'm really trying to go a different direction from FT since I have not had good experiences with them and I like the whole "race boot able to perform in the park." So basically there are two screws in the back. If you take the top one out, it goes from Lange's 100 flex to 90, if you take the bottom out, 100 to 80. And if you take both out it goes to a 70 I believe. (Also helps to take both out when in cold conditions. Will make the boot warmer.) So basically what I got out of it and what makes it different the the other race boots in Lange's line is it has a more dense liner then the 110 and 130 flex boots so it is a comfier and softer race boot. Which really intrigues me since it will have better heal hold, and the low volume liner will make for good transferring power.

So my question is, have anybody actually skiied these in the park? They are the right fit for me and also has anybody experienced shin bang with them?