Clones dying!! Need help!

Hey, So I took 12 clones and 3 already died, Im using TakeRoot powder, a spray bottle, and a heating pad under the clones.

I started with 4 Purple Diesels, 2 Skunks, 2 Blueberry, 2 Purple Kushs, and 2 AK x Lambsbreath
1 of the P.D. died, a blueberry died and an AK x Lambsbreath died

looks like over-watering.does the cup have drain holes in the bottom?

dang those are some good strains to loose

is the heat mat cooking them, try using spring water next tim till they root,,may be your water.

I have 2 drain holes in each cup, but it still may be over watering because they're very damp
I am going to add another drain hole to each cup

i think it's 2 late. it won't hurt to try but i think they are done