This may be a dumb question but what is the optimal height to have the bike at? I ride a 2014 wee and am 5-8. I had the stock seat shaved down a bit to make it more comfortable and get me a little closer to the ground but still seems a bit high. I can't flat foot with both feet. Can't even get the balls of my feet on the ground at the same time. I can either flat foot my left with a slight lean or I can do tip toes on both feet. Do I need to lower the bike more? How?