Thanks, everyone, I appreciate your advice (and concern). I've toyed with the idea of changing. I'm doing fine with clipless on short road rides and multiuse trails that don't require curving around trees and through unexpected tight spots. Or sudden stops. I've been doing well with sudden stops on road or multi-use, probably because I can always swerve to the side or pull onto grass to readjust. That's just not an option on a rooty singletrack. The combination of speed, downhill, and sudden stops adds to the risk and fear factor. I'm going to work on it for the rest of the season, and if by then I just can't handle the combo of clipless + mtb, I'll switch pedals. I'm also thinking it could be that I'm just having way too much trouble with the Candy 3s, and that perhaps I should change to Frogs or something...