If I was in your boat I'd wait for a good mass-produced LED fixture to be released as previously mentioned.
I don't think your issues are inherently a T5 problem. It's an issue of a suboptimal T5 fixture with suboptimal bulbs and suboptimal number of bulbs problem. You just don't have a very good T5 setup all around.
With that in mind, I would certainly suggest a change given your aquarium dimensions and desire to keep SPS. I would just be inclined to make the change to LEDs as opposed to MH.
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SPS Dedicated 24x24x20 Trimless Tank | 20 g Sump | Bubbble King Mini 160 Protein Skimmer w/ Avast Swabbie | NP Biopellets in TLF Phosban Reactor | ATI Sunpower 6 x 24W T5HO Fixture | EcoTech Vortech MP20 | Modified Tunze Nanostream 6025 | Eheim 1260 Return Pump | GHL Profilux Standalone Doser dosing B-Ionic | Steel Frame Epoxy Coated Stand with Maple Panels embedded with Neodymium Magnets
"Mens sana in corpore sano"
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