I have a second XBLA silver account that I created pretty much exclusively for the purpose of testing Trials HD tracks.
(Primarily it was for getting all the medal times on my Trials HD tracking spreadsheet, but I've used it for other kinds of testing, too.)
On several tracks, however, I got too high of a score too quickly. For example, I was trying to get a gold medal on the "Down the Stairs" game (65 bones), but instead got 130 bones (platinum).
So is there any way to reset my Trials HD leaderboard rankings for this account?
Or would I have to delete the Xbox account entirely and then re-create it?

can do that if necessary, I don't have any other gamerscore I care about.)
I suppose I could get yet another email, and create yet another new account, but that seems kind of silly, when I already have 2 (well, 3 actually, if you count my Donkey Bike account).