One of the problems with the Botero backgrounds is evident in these shots--wrinkles. Whenever I use a Botero background these days, I do my best to either a) avoid hitting it with light or b) hit it with so much light that the wrinkles aren't visible. The biggest problem is that what you really need (increased distance from the subject to the background) isn't possible with such a small collapsible background.

As far as the wrinkles are concerned, they're really only a distraction on the first image. However, the subject has an odd glow on his back that is more visible than on the others. Did you decrease the brightness of the background in post, using a soft brush to get in close to the subject without going too far and affect the rim light?

I'm in agreement that shot #2 looks overexposed on the skin, but shot #3 is (in my opinion) is just about perfect.