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@Rourkie
Hi I'm a framebuilder and frmae renovatorerer so have to remove stuck in things all the time.
If you can't remove them with plusgas etc. Then don't just resort to melting the post. The crucial thing is heat, but not just loads of it until it melts. Usually even the most stubborn ones come out intact by heating the frame to the lowest point of where the seat post goes in then attempt to turn just a very slight amount then we let them cool a bit but not to go cold then we put them in the vice upside down clamped by the seat post, thus turning the frame by the head and stays and it should then come out. Sometimes turning the frame is enough for one person if the bike still has kit on it, so get some one else pushing upwards to give the force needed for it to move out.
Hope this helps any future sufferers.