their bound to die alittle bit, next time try cutting the leaves in half to lower the rate at witch they transpire. even with this some leaves will die, but the plants should all survive.
and buy a clone dome if you dont already have one, their like 75 cents.
I only spend 15 dolars every 2 months or so on cloning acquipment, and habe had 100% succes rate, every few batches one may die, but thats because I did somthing wrong, and I usualy know what I did wrong.