You mentioned your work out routine and how you are not improving, but you did not mention in what way you are expecting to improve, which is a HUGE determining factor in the abilty for someone to give good advice.
do you mean improvements in endurance, all out strength, physique, punching power, flexibility??

One person mentioned to up your calories, but the "improvements" you aren't makings MAY have been loosing bodyfat? and upping the calories certainly wouldn't help that..
Sorry, i'm eager to offer some training advice also but need to know exactly what your trying to improve.