I almost always use a 9 ft. Umpqua leader but the kink in the butt that develops when the fly is in the hook holder and leader bent around the tip guide (eating lunch, or changing spots) could be eliminated if I shorten up to 7 1/2ft. (with a 8'6" rod)
How important do you think 18 inches of leader butt is ? I hate that kink, it effects accuracy, drift angle, and causes strike detection problems (I don't use bobbers/or the more PC term "indicators").
The other "fix" i considered was relocating the hook keeper to the reel seat...or reel, thereby only having to alter the leader 6-8 inches.
I just want that leader to stay straight, without kinks or bends that are hard to straighten out...those leader straighteners don't do the trick either, they will smooth out the coils, but not a kink like you get when the leader is bent over the tip guide for 20 minutes.