I think this is the most important parameter to compare with:
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loginLonger <=> slower
Shorter <=> faster
The weight and damage (+ damage type) can vary a bit, and thats what gives some weapons an "edge" on other weapons of the same category, but it also follows a quite linear progression between :
More damage <=> more weight
More damage/weight <=> slower
etc...
There must be some "incoherence" somewhere, since cRPG host so many different weapons, but nothing too strange when you really compare all the stats and their equivalent counterparts.
My post doesnt mean that some polearms cant be buffed, just that they doesnt need to be
because of the speed and weight that you used to argue.
I think the animation is where we should be tinkering more...