I’m curious why your AMS is such high RH - Mine are all between 10 and 17% right now and the print room is a humidity nightmare - the AMS(s) appear to be if not air tight…close to it - so why is yours so high?
I have a spool of PPS in one of my AMS and after the initial dry it sits in the AMS for about a month before needing to be dried again… a month of the AMS being open and closed twice a day. PPS is probably the worst case scenario for filament and moisture and it lasts a month in my AMS.
So I’d suggest the rubber seal in your AMS is either perished or weirdly placed in the channel (is it hard to shut?). One AMS I received had a poorly fit seal and it leaked like a sieve and didn’t keep the air dry until the seal was reseated.