So I followed all of the directions, but when I got into the Morgh editor, I looked for the overswing_spear flag to check, and the only flag associated with that has a '(WFAS)' after it (I assume that means it's a 'With Fire and Sword' animation). So with that being my only option I checked that, and it did change my overswing animation, but it changed it to an alternate polearm overhead swing instead of an overhead stab.
I think I did something wrong, but I'm not sure what. I assume there should be another non 'with fire and sword' animation available.
Thanks again for being active on this thread, I know this is an old post.