Replying to Boot help...

So I've bought the Full Tilt Hotdogger, and they are great, the only bad thing about them is that they are to thin for my foot. I didn't feel this when I tried them on for the first time.
I can only feel it after like 20 mins and more, and it's really painfull.
Two weeks ago I got them widened out (or whatever you call it) 0,5 cm at my local ski shop, and I and the guy working there though it was gonna be enough, but it wasn't.
I've only been skiing like 10 times this winter bacause of this problem, it sucks, and it's getting pretty damn expensive.

So NS, help me, is it possible to "make them wider"  like 1 - 1,5 cm more?
Should I buy new boots?...

Thx ALOT for help :D