I dunno if you can see post signatures the way you browse (and most are easy to tune out anyway) but if you ever noticed mine, it says:
"Comparison is the thief of all happiness."
– Theodore Roosevelt speaking on purchase of his new LED system.
The quote and source are real!
Not sure he ever had a tank though...I took him way out of context.
The sentiment is REALLY REALLY real....you can stop looking around at other tanks so much for validation about now. If your corals are growing and happy, they just are.
Pop is a ******** concept and
photographs are impossible to compare with your real tank that you see in real time every day. Just let that go.
Sounds like you're also planning to add a lot of complexity to your tank. Never a good idea without a solid need for it, so if you think there's any more room for planning or any of that stuff is being added "just in case"... Hopefully you get my gist.
I would stay on the upgrade path since it does sound like a concerted effort.
But I would do some more thinking too! Make sure you're applying upgrade money in a way that will really address what you're trying to address.
What have you done to assess your current nutrient situation?
What have you done to assess your current lighting system?
What have you done to assess your current flow situation?
All of these things can play a pretty major role in coral growth and color.
Nutrients - It's very common for things to get out of balance when using "current methods" which are more or less based around starving a tank from Day 1, but accidental things can happen as well to throw things off.
Lights - Almost nobody uses a basic $15 light meter – how much light are you even putting into the tank right now?
Flow - Flow can be legitimately hard to do and to assess, so it's usually worth a re-think.
You may have given some or all of these things consideration already.....just saying just in case.
Let us know about how things are in these three areas and it'll actually help inform the best way to proceed on the lights.
Might turn out that you're more due for a flow upgrade than a light upgrade! Or maybe it really is the lights. Or you may find out that both are in need!!!

Honestly it's hard to imagine the lights are to blame....of course (like anything) they can be done wrong, but a 4-bulb T5 system is a pretty standard unit of reef lighting. So I'm curious if we'll uncover something peculiar there, or something in another area to fix. I like troublshooting!!! ;Shifty;Bookworm;Writing