I hear ya man. I got up to 220 in college, but as a wide receiver that was just too damn big. My legs were soooo heavy. I ended up having to cut down to about 210 just to be able to run in the open field.
That's exactly the way it was for me. I just felt so heavy. I could move tons of weight, but cardio was such a pain. I thought that maybe I'd "grow into that body" ...but it never happened. So, here I am, little again Well, not really, but compared to some of the monsters on here, anyway.