Nice snake. He does appear to be built a little like a girl so I would check to be sure, but the founding sire of my large lines is also built like a solid female. He wants to be bigger than he already is but I have tapered him off a bit, small rat every two weeks, and he is still growing.
As long as yours is solid I don't think you have anything to worry about, but he could probably be safely bumped back a bit.