I second all the other complaints about how the growth falls off and I'd like to actually suggest a solution: make it so your stats level faster the greater the difference between them and the highest stat (I.E. fat is my highest stat, so muscle and naughty bits should level faster until they catch up), while the highest stat itself levels faster as you start slowing down on getting taller, because if the mass isn't raising your height that much then it should raise your width faster