Grace f-10 moving coil

I bought one of these off an a'goner last year. Initially it was a bit bright and the low end was brittle and lifeless. However, after about 50 or so hours, it is really coming to life. Although it is still a shade bit bright, the balance on this cart is really sweet and exciting. The low end has shown up with fine definition, especially on well recorded lps.

I know that Grace was built by the Sumiko, and interestinly enough, the F-10 body style looks very similar to the Blue Point No. 2. The sound is also similar , but without the simblance produced by the Blue Point.

There is not alot of info about the F-10, and I have only seen the one that I currently have. Does anyone have any experience with this cartridge?