Bonk. That's the sound of the rest of your post finally hitting something solid inside my head. I didn't notice the reason you stated for wanting to use a 40mm. Sure, I noticed the 20psi, and at that amount of boost on a KA, you'd possibly be flowing too much for a 35mm.
But you seemed concerned about the 16psi spring. This suggests to me that you're not planning on using a boost controller, or that you don't understand how boost controllers work. If either of these are accurate, then you probably need to learn a bit more about turbocharging before you boost a KA to 20psi (things can get nasty at that level).
Not a slam, just a friendly suggestion.
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