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people are already capitalizing on this imbalance by making low agility, high strength builds, and more will be after reading this thread. so my suggestion is simply to remove or at least greatly reduce the wpf points gained passively from leveling up. and balance this by increasing the amount of wpf points given from weapon master.
These threads keep poping up.
1) do not underestimate the contribution of agi to movement speed regardless of athletics.
2) shielders still need it for the shield skill.
3) do not overload the WM skill and make it a must have - it is meant as a wpp boost, not the only wpp source.
If your problem is the low benefit of agility to non-shielder builds, then attack the problem at the source using a pre-exisint solution:
Give wpp per agility raised pointYes this is how it works in the singleplayer game: one gets 15 wpp per agility increase.
Then you can lower the wpp gained per level. 42/3 will gave the wpf in their weapon of choice as a well trained peasant. WM stays as an optional skill for those who need more wpp like hybrids and low agi builds. The balance should be that 9 agi + 3 WM given enough wpf to raise one category to 120ish.