OK, I had a ride and didn’t do much drafting at all. I calibrated my power meter before hand. My speed generally seems too high for the power especially on the segment Signal Hill, it seems miles out, this is a 9% gradient so not much drafting effect there. . Here are some examples from Strava. I have added my weight to Zwift which is 190lbs
Signal Hill 9% 314w - speed 15.2mph.
My bike calculator app shows 7.3mph on drops.
Signal Hill 9% 152w - speed 8.5mph.
Bike calculator shows 3.6mph
I did multiple laps and the speed on this segment seems way too high.