I failed my drift test. 53-year-old, so formula suggests 127, which felt too easy. After 20 min warm-up, I started test at 137, thinking I would drift to ~143. HR fell on average to 134 first half and 135 second half.
Any guidance on a better target starting point? (For context, my Garmin Epix set my zone 2 top at 136 out of the box.)