Blue diamond Soft tips work the best on stiff shafted cues/ and/ or on the old aluminum jointed Dufferin cues. I swear that a change to Blue diamond softs will completely upgrade your older Dufferin maple or ash shafts and the cue will play great! I don't know about CF as I don't use those shafts.I used Blue Diamonds on my snooker cue. They had a reliable crisp hit when using alot of side when playing safeties and didn't mushroom like an Elk Master