Nyles, what lights are you running and what's the depth of your tank?
AFAIK, tank depth and coral placement makes a big difference with T5s.
A 75G is fairly shallow.
Miles, maybe run only half the bulbs for a while and see if things recover a bit.
I had a 10G nano a couple of years back, and lost everything in it except the fish when I upgraded the lightint (28w pc to 80w pc), even though I was careful with the adjustment period and only ran one light for a shorter period.
Things started going downhill within a couple of days. I had only softies in it, and they just melted away within a couple of weeks and then green hair algae took over.
The tank had been going great for over a year before, and apart from the new light nothing had changed.
Nothing I did helped, and I was repeatedly told it couldn't be the light and that something else must have gone wrong, but all tests came out normal.
Maybe you could switch back to your old light for a while and see if that helps out the corals?