Anyone doing sub-20s is disqualified from running Sledge.
My nav is so bad I nearly missed the turn around point. I qualify for Sledge on the basis of my advanced years (although Wiz is older) and ability in anything other than a straight line.
I don't think you should be making excuses for yourself if your running sub 4 mins kms!
I also think you should be disqualified from having a finish split as it makes everyone else look really slow!
So if I run 20.01 am I allowed to run sledge next year?