Please don't take this as argumentative because I don't mean for it to be. I am not any kind of engineer or physicist (lord knows), but I cant see how string angle wouldn't come into play. Yes with only 2 inches of deflex you minimize that, but the tips still start behind the handle by 2 inches. With no reflex the angle is there to some degree, and it gets worse as you draw the bow. Early draw weight might offset some of that, but wouldn't early draw weight AND some reflex, like the Duoflex for example make for a more efficient bow?
CALM DOWN!
Kidding, no need to sweat here man, we are just talking and spit balling. No offense perceived. That said, im gonna need you to define what you mean by string angle? Because you and i may be talking about two different things. Im talking about the angle the string and the tips make. What are you referencing?
I will add this. Yes, recurves at the tip are best, and it happens to be my favorite design. And yes, the recurves help pick up that early draw weight, but that is a function of how far the tips have moved to get to brace, not how much they move once drawn. String tension comes from how prestressed the bow is when braced.