hey bluebear ,
i'm using latewoods formula + just a hint of koolbloom . i wish i woulda found L/W's recipe before i bought a 6 gal. jug of all 3 lol. 6 gals. of grow is gonna last a lifetime . plants look really happy though . i change the resovior every 7-8 days . i really don't think the blueberry is as fussy as i had read or thought it was gonna be . it was heat stress in the begining . as far as optinum p/h for 5 weeks of veg . i dont know . the sys. was screwy for first 2 1/2 weeks due to not recirculating . last part of veg. ph was 5.8-5.9 . i'm trying to keep it a lil lower than that for flower like 5.5-5.8 .

i wouldn't buy the 8 pk. again if i had it to do all over again bear .
i'd buy the drip coloums / driprings seperate for 10.00 a bucket and make my own system . these w/f containers being square sucks too . next grow i'm getting 3gal. buckets that stack inside 5 gal. pails and drill the hell out of em . = round w/f so we can spin em to expose new pts of plants to the light . picking the inner net pot up to spin em cause of being square is b/s -4ft plant easy 36in. across weighs prob 40-50 lbs. and no headroom . i just want mrs. crispi to have to rotate em / no pickin' em up .

i don't use the resovior or float valve like your suposed to either .
30 gal. garbage can would work just as good . i have the bigger round texas controller and only use the bottom half w/o the float valve , i have 2 air stones in the resovior and 1 sunmersible fishtank heater in the resovior itself set on low and recirculate the system constantly .

i gotta add usually between 1-3 gal. of just p/h water to resovior everyday , and p/h whole nute mix once a day due to .2 -.4 rise every 24 hrs. n thats it . i drip every other 15min = lights on , and once an hr. for 15min.= lights off .

you can save yourself money doing it yourself -you can still use hand tools .

peace
crispi