:smoking: no worries mates, that's just fine,...
.... yeah, the form is anything but obvious, but there's no way to funnel peep's to there first, so sometimes we just have to ask,...
Phil, this looks like Zn defc. to me starting,...it's a micronute, immobile (within the plant, so that means it's can't be taken from other established tissues and translocated to support new growth), so that's why it hit the tops first and worst,... firts thing we need to determine is your in-pot soil pH, which usually the info hang-up point! Best way to do this is with a quality soil pH
probe,.. the Accurate 8 is a good on, the cheapo store bought skinny ones are dubious for accuracy,... since it's unlikely you have one, we'll have to guestimate, and make some assumptions,....
Do you adjust the final nutrient solution after everything is added? Using RO, you should be using a little Ca-Mg supplement as well,... As for pH'ing RO water, don't bother! pH meters have difficulty reading it right to begin with (chemistry stuff and how the meter works is why),... only thing to test there is EC/TDS to see how the filter is performing,... wiht all pH buffering minerals removed, Ro/Di water is prone to swing wildly in pH from even small inputs,... in the future, add Ca-mg first, then nutes, let sit for several minutes to stabilize, and then take/adjust pH if needed... likely adjust up since nutes tend to be acidic,...
This pH stuff is about figuring out if you have a simple lack-of defc., or an off-pH issue causing a lockout of certain nutes; I'll drop a chart here so you can see what I mean,... the snag is, if you add more nutes to off pH mediums, things will likely get worse, not better! Soooo, what to do,.... I see no other symptoms that indicate off-pH, but that's not definitive,... best you can do is a crude run-off test... First I should point out that since you use RO without any Ca-Mg (most Ca/Mg supp's have some carbonate compounds in them, and it's the carbonates that are involved with pH buffering in solution), and feeds are acidic, it's unlikely you have soil that alkaline enough to cause Zn lock-out,... Still, the soil is an unknown for what actual buffering is in there (lime), it can (rarely) happen that too much lime got in there and is driving the pH up despite acidic inputs,... So a crude test is called for with run-off... rather than put you through the whole procedure (outlined in that same section as the patient form), let's do a rough test using water only, and collecting run-off from a clean container,.. it's lousy accurate, but if it comes out way off, it will at least hint at if there's a lockout issue,...
Your feeds are Ok for dosage I think,.. how often? Do you have Tiger Bloom as well? Big Bloom is not really a fertilizer IMO, the NPK#'s are all in the decimal range, super weak,... a great supplement, but not rich enough to be a fert',... Once we get that r-o tested, next step is getting the right supplement to treat this; I recommend a dedicated micronute supp', like Earth Juice Microblast,... treating both soil and doing foliar is the fastest way to quash it! The Grow does have Zn in it, but maybe not enough to meet demands under dilution,... pending that r-o result, will figure if you soil needs adjusting first,.....
Unique, puttin' me to work! 
Phil, please fill out the patient form in the highlighted section above here,... copy and paste it into here then add the info in- 
.... I'll be back later to see what's up....
Next time I will know to have them fill-out the form first...
