I would suggest those change to devs :

increase base damage of 2h.
remove damage reduction for multiple hit (unrealistic non sense.)

Also would made different speed reduction for shield and buckler. (shield should be 10%, actually they're overpowered thing in the game. Buckler 5%)

This would made 2h a more offensive weapon in exchange of lack of decense and speed but not so punishing.

P.s. implementing a dual wield system will add more tactical option to the game.