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Also, it's too late to do this now, but back when I used to work at an auto shop, if we had a stuck bolt or screw that was being a pain, we would try and actually tighten it to break it free, and then it would come loose. This method was mainly used on carburetor float bowl screws that were usually brass and were threaded into a cast aluminum housing. With the presence of gasoline, there was sometime some nasty corrosion and it was common to strip the heads of those screws if you weren't careful. If we had one that was really stuck we'd take a T handle driver and push down real hard while turning it right and left to try it break it free, it worked 99% of the time.
Anyways, the reason I mention this is because you are so focused on pulling the post out that you probably didn't think about just putting a piece of wood on top of it and giving it a couple whacks with a 3lb sledge hammer to see if you could break it free.
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