X,
Try a complex series without the 4K. Lather up the 8k and another hone and mix up the grit passes equally. Like 5/5, 3/3, 2/2, etc. I use about a 6k and 10K mix and get nice results. 4K should work too but if you have anything higher throw that in and try that....
btw, I don't think its the complexity but rather the presence of the striations, eliminate the striations and the only thing your using to cut whiskers is the sharp edge which, without .125 paste, is really tough.