I managed to persuade sig123 to sell me his large Flux frame:
Compared to my medium it is more stable, although I think the angles are the same. The 44mm headtube lets me run my old forks as the stack height is the same with an inset headset. Got wider bars and a short stem as well, but the apparent grip from the wheels seems a lot more.
Turner do a turner-for-turner program where I can trade in my other flux for $600 against a new turner frame, which I would have to do direct with them and not through Silverfish.
I wasn’t worried about the back end being 2010 as it is plenty stiff anyway and I run a 10mm RWS, which has a lot more torque than a QR.
The back end isn’t as plush as my 2009 as that has a pushed rp23, push bushings and the enduro needlepoint bearing shock mounts, so some parts of that setup must work !