No, they are made for XM-L… no beveling required. You are thinking of the 20mm optic.
The rest of your post was accurate though, and you know I love linking to djozz’s testing. The results you linked can be used in conjunction with this other testing to compare XP-L and XP-G2, see post #51 - Crash-testing a XM-L2 and a XP-G2 on copper Sinkpads
That puts us in the ballpark of the XP-L doing over 165% of the XP-G2 at 3 amps.