I have purchased a 1/2 heavier AFTMA line for my 4 weight and my 6 weight. Both lines did not perform very well with these "recommended lines". I changed my 4 weight to a standard 6 weight line and found much better performance. I went to a Bass taper 6 weight on my 6 weight rod and improved performance. I fish ponds for bass, tilapia, Mayan and blue gills. My point . . . What is the AFTMA recommendation based on? Trout on a small streams throwing midges and nymphs? What length rods? What action? Seems the AFTMA guide is misleading for many of us and causes line purchases that are inappropriate. Anyone agree?