Def bend those knees, it helps me get over the tips better. i had real short skis like 160 cause my sister never used them, then when i got my new 170 somethings from armada i thought i lost the abilty to nose butter but if you bend ur knees and force urself over the tips it helps you get higher, rather than having ur tails like an inch off the ground. and ur heels hurting prolem... no idea ur boots must b bad. i had hard as boots and they always used to kill me big toe when buttering but now i got softer ones and i never have a problem anymore.