What class will you be running on that track?
2wd Buggy, I would suggest:
Rear: Blue Double D w/molded foam, Blue Hybrid w/molded foam (I just like molded foams, not everyone does)
Front: Green rips w/ 3/4 rear foams, or blue barcodes w/ 3/4 rear foams (again just the foam I like)
It looks hard packed, doesnt look like it will neccessarily "blue groove", also being dirt vs clay, I would stay with something that has a little more lug.
You could also try a Green splitter(rears only offered) for if it does ever groove up to med/high bite. But I don't know on those specific conditions how they would react.