I wonder if you don't have a bit of debris blocking the bleed hole of your release valve.
the filter looks like you had opened it for maintenance, is there Desiccant in the filter or just the foam filters? it sounds like if there is desiccant in it, the desiccant balls are acting like check valves and not allowing pressure to be released properly, just my guess...
Thanks brew. So far I like it I think it's great. I haven't tried any others , but maybe if the gx had some stronger fans too cool it down better would be nice.