It is like combat mastery, at r1, you get 15 extra percent balance.
So it's not all the ranks combined, just 15% total.
Correct.
You only need 84 dex now if you wanna use 222 r1 crafted broadswords now.
(Thats with r1 combat mastery, r1 sword mastery and the 29% Balance r1 crafted Broadswords)
My claymore has 29% balance and it's unupgraded, my broadsword 11%.
I still have 70% with my claymore and 6x% with my broadsword.