@Sebe56 I use 66% promix bx . and 33% coarse #4 perlite. amended with Azomite, earth juice Myco, and Espoma for veggies.
for feeding, this is my first grow using Megacrop 2.0 amended with 5 ml. cal/mag. a pinch of azomite, and more espoma. and molasses.
works as well as my old mix for vegging. with a much better PH. less checking. after mixed pretty close to 6.5 PH.
last feeding +looking for bloom, added Bat Guano. to boost P K numbers. my old bloom mix needed quite a bit of PH up.
this mix more stable, BUT I don't know how this will work for bloom? megacrop has a high N rating, I usually drop Most of the nitrogen during bloom. this mix, I cant do that. if buds are NOT as good I will go back to my old method.