Womack,

I used a heating mat, but it was something used previously to keep a 5 gallon glass carboy warm during beer fermentation.  I've been very pleased using it to keep 75F in my Sterlite container.

Omotm,
I like the heat provided by the mat. When I had it on bottom temps at mat level were over 100, but the temp at 5 inches was 75. I felt like it was warming the bottom of my bags to much.

Nichole,
I think you will have success this time around. Good luck. Show us some pics once your cuttings start waking up.

Womack thanks for giving me your humidity levels. That's about the range mine have been in without too much fussing. Perfect. 

I will definitely post updates. I don't plan on handling them until they've been cooking for 3 weeks. So 2.5 more weeks to go.

I have a grow light waiting in the wings as soon as these cuttings are ready for that stage.