Because DDH is so new, that may have been part of the problem. Once they get some good grove on the track, I think you'll find the new tires are pretty close right out of the package on the carpet. However, let me know what you think if you get it over to Ronnie's track on the sealed concrete. More input into what may work there may be helpful to all.
That might be it, couldn't find any front grip, but WD40 transformed the tire overnight