i'm using 45/35/30 leader formula for my lighter flies such as dries and nymphs with some really soft and supple mono that i sometimes use on my spinning reels. we dont have panfish here but its what i use most of the time. otherwise, i use a twisted butt section of 8 or 10lbs mono and attach a tippet of about 6lbs or 8lbs and that comes up to a total length of about 8 feet.