I have found that most of my issue with the swing are in the first few weeks. Then once a decent amount of nutes are added it keeps it down. You just can't let it dry out all the way before watering again or you'll be near 7 Ph it seems. There is a fine line in between when to water and over water or wait and have the Ph jacked up...Annoying yes, because I thought Promix was the best there is!
If that other mix is the same, but with no lime, that will either be too low or spot on. Peat is acidic and Promix adds the lime in, two kinds actually from what I remember and apparently it's too much for Cannabis. I've no issues with plain Promix for my herbs and veggies, and we don't usually Ph those feeds and everything just rocks. Not ole Cannabis though, gotta keep that lady's Ph in line for great results.
I still have about a half a bale or more of Promix BX and I have been planning on making my own TLO mix anyway...This would allow me to add to it with amendments and lime to get it into a lower Ph range. But I'll still need something to start the seedlings in...I bought a couple smaller bales of the plain peat bales, same company that makes the PM, Premier Horticulture. As you know, Muddy, I got them for my outdoor grows, but I am wondering what the Ph will be of the plain peat...I can easily add a
little lime if needed and perlite and Myco. It wouldn't have the wetting agent, but not entirely sure how important that is...Otherwise you have a custom Promix of sorts, but with a better, lower Ph for growing what we grow.
Just brainstorming and typing here...:smokebuds: