I know from my laminated bow days that the pad angle affects the string tension at brace, or basically how much the limbs are "loaded" at brace. I made a takedown that very nearly had a slack string at brace. That was a very poor performing bow. I agree with Del too, but my advice when it comes to limb angle, less is better, but it depends on the design. If you think about it; if deflex were great for making self bows perform well, we'd all be heat bending deflex in our bows. But, nearly everybody heats in reflex unless they're building a laminated bow. I would suggest that you design your takedown as though it were a one-piece bow and then figure out the attachment particulars that put the limbs in the correct position.
Good luck,
George