I've u/l sets for the M8C H/W, 917/10 & T260 M/W.
Obviously the M8C set is much more refined, as I just LOVE
that sweet music.
I greatly increased front stiffness while reducing the rear, based purely on modern frequency theory. (a bit of a 'periodic' cheat)
I've also used a medium d/f setting, to help with the bumps, and balanced the CofP to around 48% front (technically a bit too forward but seems to work).
To make it more stable I'd add rear wing (not wicker), as the front is a more dramatic change.
So try my set (with a couple of clicks added rear) Gratulin, it might be more pleasurable (but it's still a beast).
I should be able to help make it even more user friendly, with feedback.