Try a stonger polymer like Griot's Paint Sealant and keep it maintained with Prima Hydro.
Btw, not sure the grit # on that compound you are using but be careful you don't burn through the clear.
When etched I use ScratchX and a kiwi shoe polish applicator pad (has a red handle). Its a firm foam so keeps the product at the top and works great for spot applications.
if that's not enough I pull out my smaller random orbital (3") and use the same ScratchX.
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