It does sound like dinos rather than cyano. One way to be sure is to try a does of the Chemi-Clean (be sure to follow the directions to a "T"!). If it does nothing then you know its dinos.
Not sure if it's the magic bullet you're looking for but a tactic I came across on RC is an extended blackout period for several days.
This is of course in addition to the standard recommendations of feeding/stocking less, employing macro algae/phosphate removers and water changes.
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