yeeeep
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either heat mat too hot or mothers are tired and old.
I use jiffy pellets, #2 rooting powder, a clean razor, mondi tray/dome. I lay small bamboo stakes between the mat and the tray to avoid temps getting too hot. I then start opening and closing the dome after the 3rd day gradually increasing their wilt resistance, always making sure they're wet. I usually get 95-100% success rate.
Although i've just switched to a pre made rooting pad with a 102 openings, its kinda like the green styrofoam stuff used for flower arranging. I'll be making the switch permanently as the two trays i've cut so far using this new stuff have been 100%. They offer a lot less resistance when plugging than rockwool which i found to be a problem with smaller cuttings, which often would break or not penetrate into the rockwool.
n i def agree with u kes, great knowledge always gettin dropped!