I think that fly line is around 37lbs so that may be the weakest link at some point as well.
I'm sure mine is well below that with some of the nicks that I've felt lately. Time for a new one
I really have no experience and all my comments are gut feel. I wish I did have some real world numbers.
As far as fighting a fish and bringing it in quickly, I have been surprised (especially last weekend on the blues) at how much I can really pull and have everything hold. I was trying to test my wire connections, but found that all of my setup held up to some of the most pressure I've put on fish.
And there's not much better than a fish smacking its tail, splashing you in face, on its way to fight again.