Need help diagnosing!

[MasterRookie]

Astrodawg
5 gal Root Pouch
FFOF w/ 35% perlite
600w MH on 50%
74 deg avg DT - 68 deg faithfully NT
60 avg RH

First grow ever, about 6 weeks since beans popped and everything was moving pretty smoothly. Germinated in RW under NanoDome T5, moved to solos for 2 weeks and then final 5 gal. Topped, supercropped and LST'd. Pretty sure it adds veg time but i figured wth why not ?! Fed for the first time last week using week 5 of this schedule

. From what I've gathered I'm sure I'm having some cal-mag issues. Got some dolomite lime that i plan on adding at 1 tbs per gal of water but as its slow to do its job I'm not sure how much that'll help right now. One of my main reasons for this post tho is the SPOTS !!! The closest pic i can find online is spider mites but besides the spots I don't have any of the other symptoms of mites sooo....? Please help a desperate fellow farmer !