You may have seen or read this before from Ballards FB site
Ballard's Off RoadGB says they would have done Finke for sure and capable of nearly anything.
Other info as a main set up was a little fine tuning on jetting, larger rear sprocket for Offroad (usually 13-46 to 13-50), most other things are good stick and rear suspension is great in stock form for up to an 85-90kg rider.
Fork is under sprung and you'll need to go to .41 to .48kg/mm fork springs. The fork is weird but awesome and is critical to oil viscosity and only works best with 7.5wt oil with 10mm higher oil height and compression set at only 11out to 13out!
GB really knows and loves these forks and raced with them in his WRF for 3 seasons winning many Vets championships.""
On the Ballards Facebook site, MX store is now Ballards, GB has spoken about the TTR forks on various forums & the fact he used TTR forks on the WR250F.