I wouldn't have though that there's anything unusual about your position shifting with different levels of effort.
If I'm giving it the beans (sustained 13 / 14 mph bursts of 30 or 40 seconds each*), I'll be further forward. And I have a bike fit almost every other week.
Or, rather, I had a bike fit a few weeks ago that agreed with the bike fit 3 years ago.
I wouldn't have though that there's anything unusual about your position shifting with different levels of effort.
If I'm giving it the beans (sustained 13 / 14 mph bursts of 30 or 40 seconds each*), I'll be further forward. And I have a bike fit almost every other week.
** Downhill - after all, I'm not a machine.