- minor symptoms, not definitive and not uncommon either,... BTW, absolutely not thrips either -
Your custom blend needs pH monitoring, in-pot... What you put in doesn't reflect what the actual pH is in there, too many influencing factors,....
Dr. Earth feeds are fine, but keep in mind they are organic, slower release, and need to breakdown to become available.... they have some inoculant in them, but I'd still recommend getting additional inoculants, plus Si, enzymes, and humic-fulvic... All these will help facilitate this, and cycle nutes faster and better.... Recharge is a good value for inoculant (has kelp, humic- fulvics and molasses powder too)... greenleaf nutes has the best deal on enzymes, better still they area dry product,... BioAg makes very good stuff, Ful-Humix powder 100g is cheap and will last for years (dosages are tiny because of concentration)..
A soil pH probe is a must IMO, so much depends on keeping the pH in check... Accurate 8 (Control Wizard) makes a good unit, not expensive... mine has served well for years now-