Yea... It is foams for nitro on road. I'll start asking around, as far as what is working well lately. I know there are a number of new nitro sedan specific tires that have come out in the last year or so. Jaco has Nitro shoes, etc. They're coming in different widths now, too.
Usually they run slightly softer rears than fronts; like 45 shore front, 40 shore rears.
If somebody can get with Bubba, Chris Crews, or Gary Miller, they would know pretty well, I would think. Donnie may know as well.