Lack of skill, lol. Come on man! You basically did my favorite loop at Metcalf. Was hoping you would take the low line on Serpentine because I wanted to see you send that fence line drop. You are freaking fast, man. Couldn't believe the speed on Valley View. Very impressive, nice riding!
Arm pump, soooo frustrating. I had seen a video lately where a supercross rider had a vertical bump about mid seat to remind him of body position on the bike. The further back he slid, the straighter his arms were and he believed that brought on arm pump. I used to race a cr500, because of the power on it, i would ride closer to the tank, But on the long down hills at speed i would stand with my butt pushed back on the bike making my arms straighter, that also induced more of a death grip on the bars. I was trying to see your arms whether they were straight or bent. you had some long down hills, not steep but still your body was positioned back. When I raced it was a no brainer to read and react to the terrain, but i was always trying to remind myself to 1) breathe, breathe , breathe, 2) relax your grip, rest your arms where ever possible on the course. don,t hold on so tight 3) body position Unfortunately the 500 was a vibrating monster, I used to tape my palms with masking tape under the gloves so they wouldn't blister from the vibration. Just throwing ideas your way. I am no expert in this area. I will leave a link to the seat bump video below. Smooth is fast, Blessings ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-TbYG1nxa1t8.html