Test your RO/DI water for silicates as well. Apparently the DI resin is not the best for removing silicates.
IMO it's more of a phosphate issue anyway. Your tests won't show any phosphate (or silicate) because it's bound up in the Dynos (or algae, cyano etc.) The trick is to have something to absorb the phosphate as whatever your battling dies off.
A 2 to 3 day blackout will definitely help but it won't do the job on it's own. You need to get the chemicals out of the water. If you don't the dynos will just use them to start all over again.
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