Lots of good testing tonight, thanks for the suggestions.
In the end, the thing I changed that was the magic bullet was putting the soft IFS chubs back on. The amount of steering I picked up mid-corner was phenomenal. I was never totally sold on them with a one-way, but man, they really brought the car alive with the spool.
I'm starting to kinda wish Tamiya would make some LCD-style drive shafts for the front like the Losi, XRay and now apparently, Hot Bodies.