Don't get me wrong, I think the EWP is an innovative way to look at heat transfer but I don't understand why you went that route.

I removed the clutch fans on both my 280C and my 250C and am using electrical fans for cooling. Any additional "draw" by the increased power need is limited to the actual time the fans are engaged.

I don't think the original water pump has as much of a parasitic drain as you are calculating but I've been wrong before.

Keep us in the loop. Nice to see innovations.

__________________
“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.”
― Brian P. Cleary, You Oughta Know By Now