I was a fanatical bass fisherman with conventional gear for 25 years, but I'm fairly new at fly fishing for them.
.... been using 6-7 1/2' (sinktip-floating) 0x knotless tapered leaders on a 8wt and don't have any complaints.
However, I have a leader tying kit that's been gathering dust since I started focusing on warmwater and have been thinking a bout tying a variation of John Likakis' formula.
http://www.midcurrent.com/flyfishing/bass_leaders.aspx