I ran into the same problem with seatpost angle.Still need to sort a 220mm M4 front rotor and a seat post that provides adjustability due to the seat tube angle. Along with a Funn MZX4 direct mount stem.
I ended up picking up a Bontrager Race lite with their infinity adjustable head.I ran into the same problem with seatpost angle.
Angle is fine for true downhill applications (steep terrain).
But on more tame shallower runs saddle will be nose in the air.
I eventually got a FSA SLK seatpost and put these z-race style lightweight yokes onto it:
https://www.retrobike.co.uk/threads/for-sale-australia.459776/post-3582094Seatpost is mega adjustable now!
PIC:
https://www.retrobike.co.uk/attachments/img_20240503_201449-jpg.845690/
We all have our favoritesGood to see this post still going after 14 years! My Mountain Cycle collection is being reduced a little now. I did have 14 or 15 at one point. Sold a few and a couple will go next week. Still keeping 7 or 8, must update some photos too....