I think in this video you can see the RAD these enduro trainees use (when they jump)
https://youtu.be/6JAKAI_wrOo?t=1196It seems they use way above RAD+
From the internet it seems that - if you want to go in full speed and just bulldozer the track go RAD+ and beyond, if you want to be nimble and do more 'tricks' go RAD and RAD-
I'm 183cm and took the the fm1002 L with 50mm stem and it around RAD+ I think
From the 'stack' and 'O' of the fm1001 I wonder if I would ended up on RAD or RAD- on size L on that bike
So I think the more aggressive the bike (geo+suspension) the more they 'stretch' it in each size, they assume you buy this aggressive bike shred and go fast