Basically, what Lonerider said. It sounds like you are a making a problem where one doesn't exist, but if you want to feel a tighter strap, just shorten the length of it..
Also, unless you have super soft boots, how would you expect to cut off your circulation? No sensible binding is going to get anywhere near that tight.
Sounds like a non-issue to me. Get them properly adjusted if you really want them tighter.