I've tried cloning with Peat pellets, rockwool, and a dome, all failed. Now I'm using a dyi bubble cloner, plain tap water, no Ph, no nutes and I'm out of rooting gel, and I'm still getting the best results to date.
The old saying "Save money, clone with honey" is true. Never heard of cinnamon though. I've cloned with honey, and Clonex. I get more roots with Clonex, but honey works quite well also.