I keep no pest strips in my snake room all the time as preventative. I also use reptile spray, not pam, and it says on the bottle to wait 6 hours after a shed before applying.

A shed is great to see how bad your mite problem actually is. If you catch the snake right after its shed within a few hours while its still fresh you will see the buggers crawling around on its face and such because they haven't had the chance to burrow between the scales yet.