pH -- Are you ph-balancing what you put into it? Did you test runoff? Runoff is not always representative of the reality inside the medium, so you need some baseline expectation from healthy times in order to assess it properly. It will never be exactly what you want unless you go to extreme measures that are unnecessary ... e.g. excessive runoff can do it, but also a waste of resources.
So, you can answer that one yourself...
Many, many things cause interveinal chlorosis. This does look like an Fe issue, which would more often be related to ph or nute-lockout than an actual phyiscal deficiency of iron in the medium. Mn and Zn are in the same boat. Due to location, i'd lean Fe.
diagnosis from leaf symptoms alone is not enough information to be confident excep for a few things that have distinct enough symptoms. Cross reference all the info you have and make a choice.
anything that uses words like "activates" or "enhances" or 'bud candy' lol.... 99% chance it's just a gimmick and the ingredients are normal everyday ingredients that any other fertilizer product might use.
Foliar feeds are completely unnecessary and amount to masturbation if not done in response to a specific problem needing local attention. Feed through the roots. Feeding through stomata is just not a smart idea long-term. AGain, one of those things that makes you feel like you are doing something special and unique, but is not necessary nor helpful under normal circumstances. Cloging up stomata with mierals is a bad idea. Stomata are for transpiration. Roots are for nutrient intake. Stick to that.
So yeah, the foliar spray very well could have done this, because it's very easy to deliver too much of something (too high of concentration).
if you must use a foliar spray, test it out on 1 or 2 leaves before applying to the entire plant. Good practice. See if it fucks those leaves up after a couple days before you do the whole plant.
foliar sprays are okay in response to a specific problem, otherwise it's just an act of onanism.