Ben, I'd drop the fin height to 4mm too. Also, think of your inlet as if it was 4 separate nozzles. With your hose barb sitting almost ontop of the center crossed fins, it's basically 4 nozzles in one. With my calculations and experimenting, though I'm no pro at either, roughly a 4 - 5 mm opening for a round nozzle is best. That is what I found but that is for a round nozzle where your's is a triangle with a rounded bottom. I suck at geometry so calculating that area is beyond me. You could make your inlet square to meet a round hole for the barb. An idea that may be easy?
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