Nice purchase!
If I were selecting a cartridge for that setup, I'd go with a ZYX R-100 Fuji - low output version. The Fuji is a world class cartridge that will run head to head with just about anything, and costs only about $2k retail. I think it would make a nice match with the Graham, and the Teres 265 TT is one of the finest made. If that combo doesn't do it for you, something is wrong somewhere. There should be no brightness concerns with that combo.
If I were selecting a cartridge for that setup, I'd go with a ZYX R-100 Fuji - low output version. The Fuji is a world class cartridge that will run head to head with just about anything, and costs only about $2k retail. I think it would make a nice match with the Graham, and the Teres 265 TT is one of the finest made. If that combo doesn't do it for you, something is wrong somewhere. There should be no brightness concerns with that combo.