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Adding DE will:
(a) test your filter. If DE blows back into the pool, your filter 'fails' and needs service.
(b) IF it passes, added DE will help filter fines, but it will also make the filter stop up much faster.
I recommend testing with a small amount of DE, and then adding more if it 'passes'. But I'd recommend waiting till you are ready to vacuum.
Adding DE to the filter worked like a charm! filter passed. nothing blew back into the pool. after about 4 hours it was ready for a backwash. repeated with the same amount of DE and the water has been crystal clear ever since with no BW'ing needed. overnight CL test passed and now im letting FC fall down to 3-6ppm. thanks for the tips. water looks great!
Good news! Thanks for the update.