i learned that the hard way ^
ive been off skiing for 5 days, my shins hurt so bad.. forgot to tighten them in the morning and skied all day. pretty much couldnt even drive. rook mistake.
tighten em as tight as bearable, 99% of the time a boot that is so tight you lose circulation, fits. (someone might contradict me but that show it is for me) after talking to many expert bootfitters they actually told me, for more performance just tighten the fuck outta the boot so that its 1 with my foot, and its better to have it that tight and just undo them before every lift ride.
tight = the boot will flex WITH your boot, not against it.