I may be waaaay off track on this,
but...... if the issue is drivability at speed (over 650 mph.) , I ask myself: what is the difference between the cars that have done it and those that haven't.
When I compare the design of Bloodhound VS. Thrust, the thing that is most apparent to me is the track width of the front tires. Width = Stability.
Thrust has proven that the "reverse trike" platform has merit, and that being wide doesn't mean going slow.
From seeing the control issues of the Bloodhound, the Carbiliner and the NAE, they all have one thing in common, the small FA "tricycle" design of the vehicles.
I'm no engineering genius, just a backyard mechanic, but in my world (dirt), width is good. Give me a wide stance anytime.