Do you guys match diameter or lb test when using braid backing? Ive got a bunch of 65lb and 50lb braid left with less than 100yds on it and I want to use it for backing. I was wondering if I could go smaller with the braid. For instanced a 15lb fluoroleader with a 20,25,or 30lb braid backing. Also I am not talking about a 10ft leader I mean at least 150ft. 

As long as the knot is well buried, it doesn't make any difference.