Yeah, these graphs look about right. The ridges at 5K and 10K bothered me over time. I was used to them, so Grados weren't that bad to me when I first got into this hobby.
These were my daily headphones for about 3 years while I was in college. Once I got into other headphones I stopped listening to these. I busted them out for an evening a couple of months ago, and my reaction was like purrins -- "odd".