I've got a 61cm P3 with tri bars--I'm 6'4". Riding down on the tri bars makes me ache intensely across the base of my neck and between my shoulder blades. The forward extension of my tri bars is a little short but workable. I constantly slide toward the tip of my seat (I'm using the 78 degree seat angle). I feel like the handle bars are too low, but when I mentioned this to the guys who sold me the bike, they insist that I'm in perfect tri-position and that lifting up the handle bars would expose more frontal surface area to the on-coming wind. I get to where I want to look straight down at the asphalt because it hurts to bad to lift my head to see forward. I was even thinking of installing a mirror on the frame between my knees so I wouldn't have to look forward--I could just rest my forehead on the handle bars. What's wrong?? Is it the steep seat angle that slides me forward maybe making me having to brace my shoulders too much? Obviously, I'm going to have to manipulate this bike around and see what works, but I'm hoping someone out there will give me some hints as to what to manipulate first...that is, should I get longer tri bars(I currently have an integrated handle bar/tri bar/shifter/brake set...it won't be cheap to replace)? Raise the handle bars higher? Change the seat tube angle to 74 degree? When I'm tucked in the current tri position, I can cruise at 26mph for miles on a flat surface(so I figure the bike guys are right about it being "right"), and it's not my legs or lungs that finally cause me to quit the effort--it's the burning between my shoulder blades. I can't imagine this is normal. Please tell me there's a fix for this.