FWIW...
I like that last design too, Tex.
If I can suggest... First, making round pins is unecessarily difficult. Given that, and that the flow is incoming at 45 degrees, you might consider making square pins, that sit at a 45 degree angle from the base, pointing towards the barbs.
The main benefit is that you'll now have a base with twice the surface area. You can play with the angle, and the remaining baseplate thickness, to optimize the whole thing.
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