Replying to Toe bang

Ok so this technically is not a skiing question but it relates very much to ski bootfitting.

I downsized in my aggressive inline skates for a performance fit. My feet are 273mm long and the skates I bought are 272mm long (taking into account the liner, which is integrated). Naturally, the boot packed out, and I don't have to even tighten it to get a snug fit, but I am still getting toe bang every time I land. Jumping even a 3 or 4 stair is now virtually impossible because I come down too hard. What can i do to remedy this?
The skates have an integrated liner and they have a leather skin on the outside, so idk how well they can actually be bootfitted the same way a ski boot can.