After re-introducing calmag last week the new growth on the plant seems to be much healthier. Lower growth is still showing symptoms, but its hard to tell if it is newly developed or just left-over from before I addressed the problem - continuing to monitor. New nutrient is: 0.8 tap + 0.3 calmag + 0.1 PK booster + 1.3 base nutrients = 2.5 EC. I know this is a lot higher than typically recommended, but since my tap water is so high I don't have much choice. They've seemed to take it just fine though with plenty of new healthy growth throughout the week (which is filling out the ScrOG nicely) and no signs of nutrient burn - also monitoring this. For better or worse my PH seems to consistently drift downward now (previously it would drift up), so I've been PHing the water a bit over target (~6.0-6.3) and letting it fluctuate.
The stems seem to be bulking up a little bit - especially the main tops which are pretty beastly and hard to restrain with the net. I've added some extra string to give myself more tie downs. Next grow I am definitely going to go for the weaving approach, as I think that will help prevent the net from getting pulled towards the plants as much (right now I'm left with some big gaps in the net between the plants).
From what I have seen in other people's diaries and in my own as well, those tips are looking just normal. Don't be concerned, especially at this point of time in the cycle!