Is this devolving into a Pole vs 2her debate? I do agree that stagger should go, but 2hers and poles seem pretty balanced.
If you want, perhaps do something to promote their strengths? Such as giving 2hers +1her/Pol prof if they use their weapon in off mode [As an example, using a longsword with a shield will add 50% of your 2her prof into 1her for as long as it's used that way, or if used in half sword mode, 50% of your 2her prof will go into pole prof for as long as you use it that way, again, just examples]. That might help diversify swords or other weapons [LS/Katana/MS with shield for chasing archers, or running into pikes, 2h mode for everything else].
Edit: Apparently Vexus wrote something somewhat similar when I was typing
For poles, IDK, I used most of them until they piss me off/annoy me/fail me, then I start the cycle all over
. Most of them work fine [long voluge is one of the few I wouldn't touch again] and I don't think they need any diversifying stuff from my experience against them.