Looks like we're cycling back to my proposal of 125K per level increment which is just a shim over 8M (8.125M) per to get to 30. I had actually considered suggesting bumping it to 135K per level increment which would be 8.775M total XP, but the suggestions here that it should be around 7.5M total at about 115K per level has convinced me that my original proposal is just about spot on.