your nitrates are on the high side this could be a good factor why your corals aren't looking good .
1.021 is a little low for a reef I keep mine at 1.025 . going from a brighter led
lighting back to a t-5 florescent can also affect coral , give them time to get used to the weaker lighting .
leather corals are easy to keep and they will show if they are not happy ,
a picture of your other coral in question can help us ID it , never mind found it .
yes it does look like some sort of cover coral.
High nitrates lead to phosphates something to look into could be from something as simple as over feeding , I keep a schedule of every other day for feeding.
how often do you do water changes ?
to drop nitrates and phosphates a 50% water change will drop your nitrates/phosphates by 1/2 20ppm to 10ppm , this would also be a good time to slowly raise your salinity