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I took a look at your new nozzle, and while I didn't copy your changes exactly, I have made similar changes to mine. I can also optionally add the fins. I uploaded an STL of just the lower section of the duct including the fins for you to take a look at.
I am going to change the bottoms of the mounts, as they look like they could cause problems printing it, and mine are much cruder than yours, then I am going to print out versions both with and without fins, and compare them