Your tank is beautiful! I believe you're doing a great job too. You said you have an undersized skimmer, that would be the only thing I would change. Especially with the fish load, you'd want a bigger skimmer.
I mostly do water changes, 20-40 gallons as needed but I do need a bigger skimmer, but also need a bigger sump to go with it! Thanks for the kind words!
More photos! I want to see your pipefish and rabbitfish! How do you like your pipefish? Does it do well in your system? Is it an active (visibile) fish in your system?
You asked what to put on the white rock. If you are looking for branching corals, I'd suggest orange and purple M. digitata. You seem to have a green version already, no? If not, get all three. Pocillopora is nice as is Birdsnest, and both come in at least three versions of not more. Welcome back. No more vanishing on us.