Ok, I'm totally lost on the last few.
5/16 I'm erect, less floppy, observing gash (6,5).
Only thing I can come up with is something SMILE (I'm up plus LES), SECRET SMILE would fit, but only if TREETOP is correct (not sure) and I have no idea what 8a is as GONORRHOEA comes up one letter short (GONORRHOEAL?)