Gaerne SG22 Owners With Short Legs + Break In

Just got some in the mail to replace tech 7’s.

For those who have short legs, how annoyed were you when riding that the back of your knee folds over the back of the boot? This has never happened and I can’t tell if I’d be annoyed by this or if it’s only an issue because I’m sitting in a garage being very aware of how the boots feel.

Overall the boots feel super supportive but a bit snug in my Achilles. Any suggestions to loosen up that ankle lock foam a bit faster?