>>1081604>>1081611>>1081612I figured out what was going on maybe half way through my ride, I was spending far more time out of my saddle on climbs than I was spending in spinning my ass off.
I tested my theory, I got out of the saddle and peddled my ass off, near instant leg burn. On another go I stayed in the saddle and peddled my ass off and got significantly less leg burn and was actually going faster.
I knew about "spin to win" but somehow convinced myself "getting out of the saddle = more power = more speed" but it seems I was getting out way more than I should have.