i did what you are doing. i'm going back to 9" drivers. yes,you get more top end,but puts picks closer to heat exchanger. track gets a little loose and at the higher speed can and will get the exchanger. you tighten the track so it doesn't hit and suspension gets stiffer because the larger drivers and larger rear wheels take up so much track. suspension doesn't rock back as much. this lets front and rear part of suspesion couple together to quick. i'm also adding some guards on exchanger as mentioned in a topic earlier. for lake runs it still will work good.