Sounds like you need an 0-10-5 or something like that
(compost usually supplies some potassium but not
much phosphorus, and your description indicates plenty
of nitrogen). What is the pH like in the beds? That affects
phosphorus uptake. You want around 6.5 (not under 6.0 or
over 7.0).
Maybe dig 2 bags of rock phosphate and a bag of greensand
into each raised bed? That should raise the available phosphorus and potassium for years.
A soil test is a good idea, though. Then you know for sure.
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