Suspension squats down when I sit on it, middle pre load setting, last year rebuilt rear shock, then replaced center and rear shock, ride was better but now after 1000 miles on new shocks, suspension compresses and won't come back up, rides like I'm on a horse cart with a solid axle. I bought this sled because I wanted a cushy ride. Somethings wrong, my 2011 F5 with non adjustable shocks has a way better ride. When I get off F5, rear of sled pops right up on lightest pre load setting.. otherwise love the sled. Thanks in advance for any help!!