Thats a pretty neat humi. 60-65% RH is just fine. Levels above 70% just cause mold so I only start worrying once my humidor drops below 60%. To improve your seal, see if you can't shim the glass a bit. Also, consider a foam gasket around the door. You will need two or three days to allow the humidor to out-gas the gasket odors, after you install, but those two fixes should address most of your issues. Once you get it sealed up properly, it should only need a 320g boveda twice a year or so.