Replying to My boots don’t fit, send help

I currently own 2015 Full Tilt Booters. It was probably not the smartest purchase because the boots are for a wider foot when I have super narrow feet. Anyway last season they felt SUPER sloppy especially outside of the park just cruising around the mountain. I wore two thick socks on each foot which helped a bit but still not enough. I have not gotten the liners heat molded as many of my friends with Full Tilts said the liners would mold overtime with use. My question is, what can I do to make my boots fit better? I’d say my main problem is even with all of the buckles at their tightest, my heel still moves up and down quite freely. I know there are heel inserts out their, but would they even help all that much with the situation I’m in, where the boots feel too roomy in general? Or should I just go all out and buy new boots this coming season?