Thanks for answering! I was looking at Bella's guide too, but it doesn't show WR so I questioned forum. Where do you see that on Bella's guide?
i used the chart at the bottom. it says gen1 will 100% 2-hit the 30k HP blood hafs at 750TMA, meaning it does 15k dmg per hit. so since windraiders have 16k hp, i estimate another 20TMA will get over that 1k hp deficit
770 seems pretty correct. I like this calculator app made by @Cyraptor. I believe it's accurate, and if so, you can input your exact stats here and know for sure what you can and cannot 1-hit