On my ride yesterday my Garmin 500 recorded 2901 ft and my mates 810 recorded 4278 ft! Does make the climbing challenges more difficult!
My 500 robs me of around 500ft on route with 3,500ft total elevation. Friends with other 500's only lose 100/200 tops. (Almost 1,000ft out on the IOW Randonnee )
You can try setting an elevation point and also leaving it switched on for 30 mins or so before riding to stablise but think it's partly luck of the draw too.
Another less 'intense' turbo session, increasing my sleep slightly to aid recovery for my lifting. Been a bit guilty for slowly getting to bed later and later the last 2/3 months. So another 30-60 mins sleep a night should add up nicely over the week. I sleep well regardless, I just need longer I think. (Nutrition is covered )
https://www.trainerroad.com/cycling/rides/2132685-Elwell
https://www.strava.com/activities/326697239
Kept cadence on the high side for the first two intervals and had a bit of a blast/mashed towards the end.
Re-test FTP the week after next I think.