...expected to be more constant on long downhills -1 000 meters...
What do you mean by constant ?
Because of your last week's comments... I'm torn between a M or L size now... Thank you so very much !
I'm about 1.5cm shorter on the torso than you, but you like to be flat on your bike with a 40mm stem.
I took a M planning a 50mm or 60mm stem to match my current horizontal distance, and a little more drop, but still higher than my gravel&road bikes.
It may be late anyway, as it was planned to be built these days... but it will be few grams lighter in M