I don't think you are doomed. You can try cleaning it but that solution did not work for me. It didn't slip as quickly but it still slips. I think fietsbob's solution of a second quick release is the most cost effective way. Purchase a 32 mm collar and grind away the lip. Even if you fold it a lot it is only one more flick of a lever. Others have had good luck with titanium seat posts but those are costlier. I am going to try the quick release method first.