Just out of curiosity - don't the side harpoints bug out sometimes and prevent you from firing? It's not a problem with the multicannons, but I'd get pretty angry if I was lining up a PA shot and it stopped charging in the middle...
Yes, I have both linked to together but many times only one will fire. When I had gimbal cannons fitted I figured it was the fins on the bottom blocking a clear shot (one reason I went to fixed) but that shouldn't make a difference with PA's