I also tried the Zeb at 170mm and didn't like it so much. Raised the BB and lifted the front end and unsettled the balance.
I just checked out the specs and noticed that although Trek list a 170mm as compatible, they also say that the axle to crown limit is 580mm. The Zeb at 170mm has a 586mm axle to crown, so actually falls outside of Treks recommendation. Just an FYI.
Possibly why @Doomanic feels good with the 170mm and others on a Zeb not so good (His Yari is 5mm lower at the axle to crown).
Trek Rail Specs:
Rockshox Zeb Specs
I just checked out the specs and noticed that although Trek list a 170mm as compatible, they also say that the axle to crown limit is 580mm. The Zeb at 170mm has a 586mm axle to crown, so actually falls outside of Treks recommendation. Just an FYI.
Possibly why @Doomanic feels good with the 170mm and others on a Zeb not so good (His Yari is 5mm lower at the axle to crown).
Trek Rail Specs:
Rockshox Zeb Specs