seems normal, based on what i can see i suspect this is a strain where the fan leafs will turn purple/black by the end of flower. not all strains do this. i would only be concerned about a deficiency if i was growing from a clone and i hadnt seen this variety turn purple previously. for now i would just continue to feed as normal. i also like to grow in peat ive been using promix for the past decade or so. im not familiar with this dirty dozen your talking about. as long as your feeding them properly you should be fine the ideal ph for peat is around 6.1. the thing about peat is depending on where it is harvested the acidity of the peat can vary so this sometimes throws off the amount of dolomite lime needed to be added to each bale / bag sometimes there isnt enough ive grown tired of that problem so i now add additional dolomite i add an extra cup per 5 gallons of peat this is likely overkill but i hate fighting peat becoming more acidic as it breaks down. another thing to note about peat its not necessary to feed until run-off you want the dolomite lime to stay where it is and break down slowly to keep the ph where you need it to be. its not necessary to adjust the ph of your feed the dolomite lime in the peat will do that for you. if you are genuinely worried about ph you need a proper ph pen with a soil probe to check the ph of your media i suggest the day after you water/feed your plants. do not check any runoff that is a waste of time with peat.