The Squid
Spaced-out CephaloMOD
I've been digging around a bit and found that this is indeed a common problem and there's a LOT of debate over the PH that should be used with promix. People running PH over 6 all seem to be having problems and share your opinion of "semi-soilless" or are banging their head against the wall wondering what's wrong when people who they trust are telling them to go above 6 and their shit is looking sad. Their are very few complaints from people running promix between 5.5 letting it swing to 6.0. Just saying man. Another thing, manufactures of different nutrients seem to have different recommendations for PH in promix which WILDLY varies. Can't hurt to try it on one plant though... I know you like to experiment, pull out that pioneering spirit, lol.
Peace.
Right on, thanks man. Much appreciated.