Looking very nice mate
I've been reading a few of your posts, going by the soil your using and your questions regarding ph i'm guessing your from the uk and started forum life on the uk420?
I used plant magic gear for my greenhouse grow late last summer, and had fair results even though it was the shittiest summer ever!
Like yourself I read that there's no need to ph anything when growing in soil, it seems if you live in a hard water area (most of the south) the pm soil will buffer, seemed only people living in soft water areas needed to use dolomite to help
As for watering, maybe your not letting the pots dry out? The soil is very light so maybe when you water its pretty saturated already?
Good luck mate, i'll tag along from now on if you don't mind
:thumbs: