So, you "drooped" in? That sounds embarrassing.
Does the second curtain seem to work better at higher speeds or the is the gap larger at slower speeds?
This happens on many cameras because they lose tension on the second curtain spring. The adjustment can be a simple ratchet wheel with a spring or a worm drive with a set screw. The tensioning adjustment is right under the bottom cover. There should be two dealies that look alike. The one closest to the front of the camera is the one you want to fiddle with. CW=more tension/faster & that's what you're looking for. A little bit at a time, please!