i will see you on the weekend . joke aside.
it seems by looking at the first picture (acro.) that growth has ceased almost completly. why would be the question. are you coral's starving? or using all their energy (the little thats left to block harmful UV? until they reach the point when they just RTN. now some people on this forum would argue that a tank will contain "enough" food, which is something i don't agree with (after seeing "snowstorms" of particles with incoming tides just recently in fiji). i also believe that corals once established are quite hardy and take a while before they die so it be more then one factor which causes your problems, and not just one "easy fix solution". the recovery if possible would also take some time.
i reckon that you "fried" your corals with that lighting upgrade and would say its the main culprit (not necessary the only one), but couple that with low food availability, nice clear strong flowing water and perhaps being low with certain trace elements (but looking at the amount of water you have been changing lately i doubt that anything is ultra low to cause problems)
good luck, as it will be a hard choice what to do next. (easiest is to go back to the same setup 6 month ago and see what happends)
ripping out rock for more flow will most likely not do any good, more the opposite it will create even more stress.
if you want to save small frags i will be more than happy to keep them for you for a while (no rent charged )
chris