I tried three reflectors with my previous generation L1 when I put a SSC P4 in it. I used the stock optic, a Fraen optic, and a Carclo. I couldn't get any of them to produce a quality beam. While throw was better, they had huge Saturn rings and other artifacts. It was so bad that I threw them away and went with a McGizmo reflector. It has less throw, but the beam was perfect quality.
Some people a lot smarter than me may have better ideas, but I would be surprised if an optic out there would throw better while still maintaining the same stock beam quality.