Matt, Maybe it didn't get sharp enough on the 4k/8k. If it's stainless, it will take longer. Are your paste strops hanging? I've read that hanging pasted strops can actually damage an edge making it duller - they need to be on a flat surface. I'd work backwards. If light 20-30 round trips on the linen and leather didn't do it, I'd do 30 on the 1u and 30 on the .5u pastes, clean, linen and leather and see what that did. If not, I'd go to the hone. I've found in actual practice that it has taken 100 round trips on the 4K, and 100RT's on the 8K to bring a bade of mine up to good enough to paste and leather it. I also have a jewlers loupe that I use to check and see if the stones are still making a difference in scratches made by the stone and it was about 100 RTs. But that was me, at that time, with that blade. Anyway remember to pay attention to pressure, not too much, just enough for the stone to do a little work. Same on pastes (on flat surfaced strop). Stropping on linen and leather with less pressure inproved my edge just by itself! Wish there was a meter to hook up to know how light is light. But then as you work towards getting that perfect edge, you'll be the meter. Good luck, Matt.
Regards,
Zig