Sorry zoom zoom, I missed that post (#5). I’ve read it now.
There are plenty of BLF discussions on which of the Convoy tube lights is the best for throw, here is one: Convoy S2-S4-S5-S6, Which Is The Best Thrower? From what comfychair said, it sounds as if the S4 reflector is what you want. (and probably an XP-G2, good cell, and DD driver…)
In case you haven’t seen them, another thing to play with would be the Ahorton lenses. You’ll have to stick with a larger host for that (eg the size you have now), but you should be able to extract more throw than your current light.