So velocity is important we (you) just don't how much velocity is needed but were (your) definitely sure that smaller is definitely better cause it causes higher velocities and possibly/probably too high for some applications require, what application we (you) don't know but let champion the smallest port possible anyways not the ideal.
Its funny hearing people parrot what's too big and what's too small......Dan Smith runs incredibly quick with a head that everyone including yourself claims is too small for the CI.
There's more that goes on in a running engine than just air flow. What's the velocity in the port when the exhaust is pushing back into the plenum?