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Mizzo'-- this is why you need an Accurate 8 soil pH probe! Don't guess or assume anything about in-pot pH, which can change quickly from OK to TARFU,...then come the symptoms, and with no pH reading, the next step is a total gamble...For deficiencies, it's either a simple lack-of, pH lockout, or toxicity issue... in the latter two, adding more nutes will make things go from TARFU to FUBAR! 
... so you see why odds are against you on this dice roll,... Firstly, the
soils are usually dogshit anymore, I think we've talked about that,.. HF is generally better than OF for being badly off pH in the bag,.. it's fixable, with some lime added beforehand and a little time to start working,... I know limited choices have you stuck,... Also, coco is not a soil, it behaves very differently,... it a component often, true, but at a lower ratio than you have,... with extra coco come the demands for elevated Ca, and to a lesser extent Mg, because of coco's odd CEC properties,... it also have no buffering lime in it, lessening the mediums capacity to regulate pH,...Remo is not self adjusting, so if you don't adjust your feeds, there's another dice roll in the equation-
.. feeds are acidic, and added to acidic soil = 
That said, I'm hearing from multiple growers/testers now that they had some troubles with Remo during bloom; veg' went fine, but in bloom the flowering performance was less than stellar,... likely a PK content issue.... where were those leaves taken from? a whole plant pic is needed,... more than one thing going defc. here IMO.... They look P defc. (larger necrotic patches), yellowing could be Ca, P and Mg linked; fine spots are Ca defc.,... funky color and texture/appearance are co-symptoms.... Now to deal with it, that's the problem,.. we don't know if this is pH related or simple lack-of,... only thing you can do is the dubious run-off testing; we have an improved method and calculation here in the Infirmary sticky section (highlighted area), but it's a PITA,... straight run-off is an even poorer measure of in-pot pH, but it can give a crude idea if it's badly off in there,.. r-o that's in the 5's pH is for sure showing overly acidic soil... P defc. can happen in low pH soils, Ca and Mg start to get iffy too,... So do what you can to get a pH reading... is your meter calibrated and in good shape? [HASHTAG]#1[/HASHTAG] equipment f-u here I see, is lousy care for meters! No proper storage solution, no calibration (7.0 and 4.0 both for best results),.. that bulb electrode is made of very trick glass, layered,.. easy to damage and ruin,... once we have some idea about the pH, we'll know if there's a need to try and correct in-pot pH first before you feed more,...
... there's an investment to be made in measuring equipment, to protect and succeed with what you've invested in the seeds, nutes, lights, operating costs and time,...
