Ok
With every thing considered with your set up, set the rear air presure in the shock to 170, then pull your straps up one hole.
With the 3'' track the straps dont need to be as far out, you will still get good coupling with them one hole up, the reason the front is so heavy is the back end is two stiff and not letting the rear of the sled down enough when you sit on it.
I have had turbo sleds wheelie up when the back end is to stiff also, when the rear shock doesn't compress as much it cant couple the front arm up and it will wheelie. The more the rear arm moves the more the front arm is pulled up (more coupling).
Change them two settings and you will see a difference.
Kevin