do u not think people worry too much about ph?,, i mean yes its important but my feeds go in at ph 6.8 but thats just my tap water + nutes =ph6.8,, and thats it thats all,, my mate uses mg soil and waters with ph 7.8 strait from the tap and never had a problem,,
as far as im concernd unless u put something stupid in your medium then ph will be sweet, the plant can get all nutes in a ph range of 5.5 to about 8 and if ur soil gets out of that range then the grower has done something stupid to get it that way
ive even grown pukka bud from ph 5.8 soil
obviously hydro is totally different but i dont give a crap about hydro as i preffer organic soil grown bud but thats just me