i don't understand...why do you use 65lb braid and tie a 15lb leader to it...???...what's the point of the braid???
It's not just about line strength. Someone else mentioned, braid as the main line allows for a much better feel on what's going on at the weight (bottom comp, cover, etc.). Also, if you get wrapped around a bush, tree, or whatever getting a fish in, braid is usually much better at not getting sheared off.
Little flex, good abrasion resistance are 2 reasons why braid is sometimes the best choice.
I agree, 65lb is usually a good choice. But lighter tests (30 is the lightest I go) work well too depending on the situation.