I am training for the 3200 mainly and also partially the 1600 this spring track season. Would it be worth returning my alphaflys, paying the $15 to cover shipping on the way back, then buying vaporflys or another shoe instead? Or at this point is it not worth it? Are alphaflys at least good enough for short track reps like 1k repeats, 600 repeats, 3-8 mile tempos etc