Thats another reason NOT TO USE MG soils......They seem to hold moisture. I know exactly what you mean that the top seems dry but underneath its still wet. Grrrrrrrrrr That stuff needs to be cut big time with perlite or vermiculite.
Do you happen to have any fans blowing on them? Maybe give it a try so the plant dries up and sucks the moisture out of the soil.
Yo yo...SUPP LUDA
