Do you know who built that wheel? Correct me if this is some sort of special case...but having that much thread showing causes me to think that if the rim doesn't fail first...the nipples may. I'd rebuild with a new rim and proper length spokes. Oh, an there's NO WAY I'd ride that wheel as is. Track riding may not have the same rough road conditions, but it does mean that the wheels are loaded with far more than your 155 lbs.
-Jeremy