Definitely start rooting it in a bag!, then if you want you transfer to perlite and ect when the roots have started to form. It may very well work for you the way you are doing it, just not how I do it, doens't mean I am right and you are wrong, there are many many many ways to do it, but i would start in the bag, but clean it well first and then wrap with ink newspaper, not the shiny ink that advertises clothes, but the regular news newspaper, the ink will keep the mold off of the cuttings while rooting in the baga, also don't over drench the newspaper, just damp. Ciao