I would not personally use peat moss because of the low pH, and I would hold off on blood/bone meal until the next transplant, when the clones are rooted and behaving properly.

You will just want to add a very good amount of a soil lightener such as perlite or even perlite and coco fibre.

One thing I wonder about is whether you might have problems with rot as compost is not necessarily a sterile medium, ya know? But I don't know about this.