for what it is worth,,,,been going thru the same routine as you all, witha bcp and was having trouble, till for some reason i put on the symetrical blades, and boom,,,,,,,hovered , seemed to make a difference, called a buddy with a flat bladed bcpp and he switched blades and said it made a dicernable difference... I have not switched back, maybe it is a fluke, but it helped me....................................