Thanks Rick. I will try your suggestion with the traction control.
As far as the engine, I guess I feel a little better if you have seen engines behave like this tons of times and it's not a problem. It runs fine and when I say it bogs a little in heavy grass I mean very slightly, not like it's really having trouble, just that there is a slight load on it. It's not really the slight bogging that bothers me, that seems normal, it's the little bit of looping that gets me.
I will mow today and see what happens. I may have the dealer give it the once over again after mowing season. Maybe I'll push for a new carb just so I know for sure that is not the problem. It's under warranty so it can't hurt to ask. I just don't want to let it go and regret it later after the warranty runs out.