There are some interesting sharpening discussions going on on Wood Central dealing with bevel angles, shape, buffing and stropping your cutters. Look for the Unicorn threads by David Weaver. David was one of the leaders several years ago in the change of understanding the role of the cap iron in tear out control. Pretty sharp guy.
I may have more on it it as I explore their finding but bottom line Paul Sellers may be smarter than some give him credit.