I've got 21 Str with 7 PS, also on polearms but I think the damage output is ok. The only thing that got a lot worse in my personal view is that all of a sudden I'm glancing all the time. I used to play Long Spear a lot (+3) but I cannot play it anymore cuz I'm glancing all the time, I've tried it running towards a standing target with medium armor, jumping + stabbing... glance. Dont know if some changes were done, it might also be the fact that my average gaming skills dropped to horrible.
I switched to hafted blade or axes, they work well imo.