On Jun 28, 3:23*pm, wrote:

snip

*It was pre-mixed, so it wasn't that
I mixed it incorrectly.

FWIW, many drywall installers prefer setting type compounds in damp
environments. The reduced shrinkage, higher strength and moisture
resistance offset the extra work required compared to softer
compounds. That said, don't change the compound type, just carefully
rework it to a nice level finish. Shrinkage will probably be
stabilized OK by now. Good luck.
.
Joe