Well since i haven't got a chance to play the Egg Spoon on a field so my answer may not be as good as people who have played with it.
But by looking at the spec and your information above in my opinion i would say 17 will be a bit easier to hit but if u can pull out a good shot from both degree then 15 should give u a better distance, and by looking at your swing speed around 88-92mph then M40 would be a perfect match for u.