Good luck, patience and soaking worked for me. My post must not have been stuck as bad as yours, but what worked for me was to unscrew the post wedge bolt a few threads and whack it to get the wedge loosened up. Took the bolt out and every morning and every night for five days I sprayed PB blaster in the hole and around the shim, and whacked the post once and put the bolt back in and whacked it to loosen the wedge more. After 3 days the wedge fell to the bottom bracket, then for the last 2 days, sprayed the hole and around the shim and now gave a back and forth turn with a pipe wrench where the seat clamps, not too much pressure though, and 1 or 2 whacks on the post. On the 5th day the post actually creaked and moved a little bit, I worked it back and forth slowly for about a half hour, until I could spin it all the way around and then it worked it's way up until it came out. Luckily I didn't have to drill it out or do any damage to the post the shim or the frame. Best of luck! Joe