I know this is probably a stupid question but I don't know a huge deal about skis and stuff yet, is there anyway of adjusting a binding slightly so I could go from a 29-29.5, also is there a chart somewhere showing with boot lengths are the same?
Well a 29 full tilt would be the equivalent of a 28 in salomon. Have you been sized up for the full tilts or just buying some online? If the salomon a fit then you would prob want a 30 in the classic full tilt shell, but 29 is huge are you sure you need that big.
Possibly this or you may need them fitting better. Are they tight down the outside of your foot? If they are the boot may be too big which is allowing your foot to pronate causing it to press on the shell. It may actually be with foot beds you could go down in size. Or it may be you need a wider boot but no one but a fitter looking at your feet can tell you. If you can go along to an Ellis Brigham and get fitted up. There the best shops for boots in the uk, if you can go to a dome shop especially castleford they have the best fitters working there.