I put a prozack clone in a 2 gallon smart pot with happyfrog mixed w 15% xtra pearlite and left it till just before flower w/o xtra nutes, it did well, plus happyfrog has mycos. Also any soil that burns can be cooled with pearlite or other similar type stuff. unless burning is from hot chunks u gotta mix emup
Anyway I like happyfrog but I would dilute it with a bit of pearlite and a cheaper less awesome soil, if u add nutes later or whatever thats your thing