Secondly, Yahoo has now SURPASSED google in roi no matter how I measure that. Same ads, same landing pages, same keyword attributes. I continue to keep my toe in the water, just a little bit with Google, just to see how far they can go.
I recommend going to the AdWords Help Center and read up on minimum bid increases and what you can do about it.
Also, I recommend having someone who is experienced with AdWords to take a look at your account to see what you can improve on. Or alternatively you can ask Google if they have any suggestions.
However, I'd be happy to take a look at your account if you wanted to talk through PM.