Guys i don’t know if you saw that in RMM’s thread he announced that he had ordered a reel of XM-L2 U4 1C’s, those could also be a candidate for the bigger die max throw.
They are reasonably CW & should be very efficient, i can’t wait to see what they can do 
They XP-L V6 1A that LEDDNA sells are suspected to only be V5’s, and if they are the XM-L2 U4 should be 2 flux bins over that 