You Norton 4k seemed to degrade the 1k edge and bevel. How old is your 4k? Have you used it very much since you got it? More importantly, have you lapped it very much?

I'm asking this because a lot of the 4k Nortons have an outer layer that has larger grit in it. For this reason, some people recommend lapping away the first 1/8 of an inch of the hone.