I raced D-37 expert on an 03 YZ 250 as well. Had it revalved by George at ESP & liked it. Bought an 06 with sss loved it stock.It would dance around a little in slow speed rocks but was like magic at high speed. It would soak up big hits,ruts ect & the bike didn't even twitch.If you haven't done so lace up an 18 inch wheel.It was like adding an additional 2 inches of seat foam after racing on the 19 for 2 yrs. Had TbT revalve last year & it was better yet. Find some whoops & spend an hour or so playing with your adjustments including your high speed on rear shock. Sadly leaving my yz for bike with the button.