They must be doing well, because i tested today and im sitting at 0.05 P and 4.2 N. My dKH has dropped quite a bit as well, but Ive been having issues using my dosing pump as an AWC. Despite calibrating both heads, it doesnt seem to do well with large additions, as its dropped my salinity by 1ppt in just 17 days.100%. shipping is going to stress and have some losses. Also adjustment to dif levels, temps, lighting, flow, ect. You will lose corals from time to time. It happens. If 8 of 10 look good, polyp extension is good, color is good, I wouldn't worry. I like where your levels are and I wouldn't use a phos remover. Just reduce nutrients going in, maybe. Once the corals are growing they will suck up nutrients as well.
The weirdest thing is that the 1 frag which died, only died on the skeletal tissue. its still alive on the frag plug and encrusting over the sides on to the rock. Ill have to get a pic tomorrow.