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I think being in this hobby for a few years now, there are certain times when tanks look good and other times, there are just issues.. I’m glad to say at least today, my tank looks happy and healthy
Try using the spectrapure di resin, known to be highly efficient in stripping some of those final elements like silica: SpectraPure‚ SilicaBuster¢„¢ DI Cartridge - Color-Indicating - 10"
Maybe try taking out the middle piece in the middle. leave the whole structure a bit further back, that way you can grow out islands in front (you dont want something like GSP growing all over your main rockwork)