murse,
If heel lift is a problem La Sportiva togue pads could help.
Otherwise you can lace your boots 1/3 of the way up, tie a knot (I use a square knot) lace them up 2 or 3 more eyes, pull tight and knot again, then finish lacing.
If your boots are too short the only solution I have is to trim your toes down.
Jim