Wow, I'm impressed at how well they performed in your video -- I wouldn't think they'd grip so well on the dirt road. The 400SM I test rode had street tires as well -- didn't think to check which ones, but I assume they were whatever comes stock -- and they seemed to handle quite well. Such a different feel to that bike though; had no idea the seating position and overall handling would be so completely different from any of the bikes I've been on to date.
Do you frequently go offroading with those tires, or switch between them and something else? I'm considering a set of TKC80's, or the Heidenau K60, or something similar for my next tires, as the Tourance EXP's on my Wee have squared off a fair bit after 13,000KM or so.