Heating mats

[minicoerulea]

Though I defer to the much more experienced folks here, I think that a different medium would not help a person know when to water -- that knowledge comes from experience, and especially from experience with a certain medium.

Repotting again probably wouldn't be a good idea. I'd recommend picking a reasonable medium (like the one they're in now) and figuring out how to grow in it. That can take a lot of time (it does for me, anyway).

Another comment: if your room temp is 68, the mats can't be 63. There's some measurement error going on here.