This really sounds like a job of fader volume automation to me. Compression will alter the sound and normalizing won't help here, so it seems like ideally, you'd just reverse the volume changes with volume automation. Not sure about the app you use, cause I use others, but you should be able to get a volume line across the entire track, and then you can move it up and down in the spots you need to, but like mmmatt says, it's a fine art to do it and not make it noticeable -- but from the sounds of it, it's ALREADY noticeable. I'm sure this is obvious now, but this is why you need to leave some headroom and set it and forget it -- because mopping this up in post sucks. On another point, if you are taping open (not stealth), it's nice to jot down on paper the timecode where you make these adjustments during the recording so you can find the exact spots in post easier. Good luck...