Yay! I solved everything. I just placed a heavy glass panel on top of the r-maid instead of its non-airtight snap-on lid. I modified the heat tape a little and now the temp is a steady 95 degrees all around. (I had trouble with the substrate being warmer than the air around it.. silly me.)
Should I just go out and get a Hovabator though? I have not had the means to do so but can get there today.
The eggs were hatched out on May 19th. So that makes them.. 15 days in.