Brown spots on fan leaves 3.5 week of flower

everyone is saying to lower the ph to 6.2 to aid calcium absorbtion also add some cal mag

She’s asking for Cal/mag

Hit her with some water soluble calcium and Epsom salt foliar sprays/ root drenches if you're an organic guy (Grow-Cal id really good as well), or start the Cal mag with every watering and I would tip dress some extra calcium or glacial rock dust into your medium.

organoman has your answer. I just want to offer an alternative idea. Switch out whatever you are using for N to "Caclium Nitrate." Doesn't matter which brand. It'll be the same 15 or 15.5% N and 18-19% Ca. This makes it easy to adjust without affecting too much of anything else, and even lowering it will still provide plenty of Ca. you'd still want a little N from your other bits so as not to have too high of Ca. I bet it would work well with just abuot any "bloom" base nutrient product. Your resulting pH has helped Ca availability vs more acidic contexts, so that is fine. Anyway, a little algebra to come out to similar weighted averages as before (npk et al), maybe an online ppm calculator with guarnateed analysis label infor and it'd be easy to give almost exactly what you did before but with cal-nitrate in the fold. Having N isolated a bit among your products used is a nice benefit. It is a nitrate, so it's readily avaiable.. may need as little as 50-60% of what you did previously (no lag interjected by microbes breaking it down before it can physically enter the roots). Depends on what you used for N before.

Major calcium deficiency............remember too, what is showing now in the leaves, is a direct reflection of what was happening in the root zone 2-3 weeks ago. Add a cal/mag booster to your fertilizer/supplement line up.........damaged leaves will not recover, but adding cal/mag will stop the damage getting worse.