Just candled the 'leaking' egg... it was one with a question mark on it (wasn't sure at lockdown candling). I tossed it, it was only 'full' looking on ~1/2 of the egg (lengthwise, not top to bottom), the other side of the egg was clear. Definitely not filled with a mature chick. Thanks for the advice!
I'm a little worried that I've opened the incubator so many times today. It's only been tilting the lid up for a quick few seconds at a time, but I'm worried that I'm making it harder for the other eggs to eventually hatch. I think part of the reason #4 had such a hard time getting out was that the membrane got too dry/rubbery. I did put a warm, wet dish cloth in there this last time to help with the humidity. Anything else I can/should do for the other eggs?
This can cause shrink wrapping in the long run and if you due such a thing the room should be a couple degrees hotter then the incubator and no drafts from any fans or coolers ......
Just some advice I learned along the way ..... And keep the humidity up ......