I bought the hovabator without the turbo, and it seems to be working just fine. Was this your leo's first clutch? Usually, a leo's first clutch is un-viable. 84 degrees is close to ideal, so I agree, it wasn't the temps. What did you use as a medium? I use a 50/50 mix of water/vermiculite. I think it will work fine.
As seen on a bumper sticker--"My snake ATE your honor roll student"