Overall the performance gains more confidence and enthusiasm as it progresses so there is a natural increase in volume, especially in the build up to the "middle 8" but the real clincher is the entrance to the chorus after the m8 which is over-enthused!
From what you are describing, it sounds like a re-track would be the more sensible course of action. It's obviously hard to say without having heard it, but "over-enthused" in my mind means that the bass line was not just louder, it exhibited other problems such as "clacking" against the pickups, fret noise - in short, the tone suffered. While compression may be used to help bad dynamics, it will not help bad tone.