Yah this is an odd issue. I've seen some people with their Google + profile face next to their business homepage. A little strange. Google also has the rel=publisher tag, but I'm honestly not sure what it does. I guess it is supposed to work like the rel=author tag... Obama uses it on the homepage:
In terms of the social signal aspect, no one can really answer that. Just try to be active in the Circles relevant to your industry. That's probably your best bet.