I am not sure about my Nike's I had ZF-1's last year and they never packed out tight all season. Got Vapens this year and heat molded the liners fit great but tried them on today with new bindings to check fit and they were crushing my feet again, putting them to sleep! I am about to take them back and get 32's.
The nike liners expand back to the the original shape a little over time. If they fitted fine at one point, they probably will again. Unless your feet have grown.