I did the same thing for my 200 gallon DT, which we started up 4 years ago. Started as a FOWLR (I always wanted a porcupine puffer), but eventually just had to have corals. I had everything in place (large sump, huge skimmer) for water quality, but my lighting was not adequate. If you are having issues, lighting is a very likely culprit. Those Kessils seem like the kind of lighting you would want, but I've never used them.
One last piece of advice. As I was switching over, I tried to keep my angels and it caused me no end of grief. I would remove any (*ANY*) angels you have, and any wrasses that are not clearly reef safe. I no longer introduce any fish that is "with caution" for reef safety. It is not possible to watch the angels 24/7, and if they nip at corals even once a day it can cause issues that you try to solve with other solutions and next thing you know you are down a rabbit hole… (been there, done that).
