I am currently training for the Philly marathon in Nov. Should I do any of my training in my flats (streak xc). I think like I'll so much stronger on race day if do all of my training in my trainers (zoom vomero). My feet will feel so much lighter. Also do you think the Streak XC are a good marathon shoe for me or should I get a pair of Zoom Marathoners. I'm 6'1" 140.