So I have a 9 foot 5 weight and i usually tie my own leaders. 15 or 20 pound mono to the fly line with nail knot, the 10 lb to the 15 with a surgeons knot, followed by 4 lb to the 10, and so on and so forth. My question, given my rod length.....IN MY BEST BEAVIS AND BUTTHEAD VOICE....HE SAID ROD LENGTH HUH HUH HUH..... what should I be looking at for a finished leader length. Right now the bulk of my fishing is accomplished by nymphing, and some small streamers, and the leader seems to be a little over 9.5 feet. I mainly ask because I am having a difficult time with my roll casts, and suspect that it might be due to the length of my leader....any ideas?

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john