checking up on our hardwood cuttings

checking up on our hardwood cuttings, too hot on those unregulated heat mats! we want the root zone to be around 15-25C (60-75F). still learning this process, I found most cuttings overheated on the bottom couple of inches - I had them pushed right to the bottom - so to fix they were trimmed and restuck - only down to 2-3 inches from the bottom. In one bin the heat created a dry layer just along the bottom, more water was needed. If you use this method, use a thermostat with a soil probe.