Send it to Milkyspit. He can get up to 300 lumens out of a KX style head (which the E2DL is a version of) so I'm sure he can boost yours. He will probably have to drop in an R2 Cree and a new driver, but it will put out more lumens.
If you can crack the head open yourself (it is tough to do) then you MAY be able to tinker with it. Upgrade the Cree to R2 in case it isn't already, or IF the driver is moddable, MAYBE you can change an SMT resistor on it to bias the drive level up... MAYBE. I don't know if you can get at the driver, or if you can mod it at all. I think Milky mods KX1 & KX2's to run at about 1.5 Amps to get up to 300L.
You could also drop in a Cree MC-E emitter and a driver to run at over 3 Amps for a little more kick. Cree seems to imply you can run the MC-E in the same optics as the XR-E, so it may work!