Been using MG potting soil w/fert for years in 5G buckets outdoors---fine by itself until July---then I use 10-30-10 for buds. Good yield---8-10' plants---3 to a bucket---8-12 buds to a plant. This way seems to take guesswork out as far as getting hung up on ph, exact portions of different chemicals,etc.
Moved indoors in Jan---realized that I need to germinate b4 transplanting to buckets under 400MH (veg) and 400HPS (bud). Biggest mistake I made was not keeping light REAL close (even if you have to bend taller plants over so all will be same height). They WILL STRETCH!!!! Buds looking OK---will be experimenting with veg times, etc. I think I'm liking the 90-100 day crop!