Strike detection is the confounding factor when fishing anything subsurface for stillwater bass. They are notorious for slipping up behind the fly and just slurping it in. And they typically won't hold on to it for more than 2 seconds. You really have to be on your toes with a leader that is as short, straight, and tight as possible, or you'll never detect the bite soon enough.
Whatever leader you choose, try to always keep every bit of the slack out, and keep the rod tip right at the waters surface so there isn't a bow of slack line between the rod tip and the waters surface.
Learn to tie a no-slip loop knot that is only 3X the size of the hook eye. That will let your fly dance sexier and I guarantee it will get you more bites than tying tight to the fly.