Sitting in the hide with his head poking out does not necessarily mean he's ready for another meal. If you don't see a lump after a day or two this is fine. I usually only see a lump right after they eat and MAYBE the day after. All my snakes are fed small rats (50-70g) and all of mine are gaining weight just fine. Just keep feeding him a feeder that is the same width as his widest girth, and you should be fine.