i have a 2004 trek 6700. the seat post has a tendency to slip down a tiny bit every 3 or 4 rides. today my legs didn't feel so good on the way home. when i got home i measured the seat hight, and sure enouph it dropped about 3/4 of an inch. i have the lithium grease on the seat post, because without it the post somehow makes a ticking noise. keep in mind i weigh 265 pounds. I am tightning the quick release about as tight as i can get it... have to really push to close it. would a non quick release bolt fix my troubles? any other suggestions?