Um, if I were u, I'd take that yellowing of new growth as a sign for me to amend my surrounding area with something with some N in it, like some good ol' worm castings, or a nice N-rich bat guano tea... U need some N, my friend... Try some greensand, and some dolomitic lime, as well... With the already present peat moss, this will help to buffer and keep your pH in check, as well as add some basic micro nutes like CA and MG, not to mention the much needed macro nute N, during vegetative growth... Thatz my 2 cents...