So I have been swapping back and forth from new to old G+ versions. There is little to be said for the new (IMHO) and I decided to pick one thing, just one and leave feedback. It wasn't easy to pick and it hardly matters anyway but when I finally did it dawned on me. Cue image of light bulb over my head as I realize, the easiest way to leave feedback is to switch back to the new version and scroll down to "feedback" on the left side.

So I have been swapping back and forth from new to old G+ versions. There is little to be said for the new (IMHO) and I decided to pick one thing, just one and leave feedback. It wasn't easy to pick and it hardly matters anyway but when I finally did it dawned on me. Cue image of light bulb over my head as I realize, the easiest way to leave feedback is to switch back to the new version and scroll down to "feedback" on the left side.
(cue image of palm vs forehead - repeat as needed)