Sounds to me like you need a course in footwork. Find a boxing coach, or a good reference book, and an open are to drill footwork. I find that footwork is grossly undertrained by many MMA guys, which is a shame, because good footwork would make the stand-up portion for a lot of guys much better.
Also, and this may seem odd, go out an start dancing. If you want to find a real good way to sharpen your sense of balance while working out in a trying cardio-stressing environment, dancing will do wonders.
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