I would think that that little bit (Maybe 3/16" inch) would not be enough to worry about. If you run your pan that low on oil, where it takes a dry suction due to an extra 3/16" or so gap on the pickup tube, you've got more problems to worry about than a little extra gap on the pickup tube. Heck I would think that you'd have to be about 3 or more quarts low for the pump to have a dry suction (maybe going around a corner). But then again, there may be other factors, I'm not considering.
Matt B.