I believe multiblade props cause most of the dramas.Sems guys with 4's don't have half the problems of those with 5's and 6's.
There's the story that the more blades the smoother and less stress but although that sounds good my way of thinking is 5 and 6 blades hook up too well.Out and then in.Like spinning your car wheels on the gravel and suddenly grabbing the road surface.
My opinion anyway.