I hear the HRC is totally hardened as compared to the HotCam Stage 1 cam which is only surface hardened. Is it true that if you go to the HRC cam you must also go with hardened rockers? I haven't heard anyone from XRsOnly recommend the HotCams cam. Two questions: 1) what's the downfall of not using hardened rockers with the HRC cam? 2) why doesn't XRsOnly recommend the HRC cam?