Regarding addons

Hello all,
As you all probably know I've been complaining about the Flight Video playback being jerky, well I've been experimenting, I have now turned my resoloution down to 800x600, and play the Sim like that too, now just for curiosity only, I took a flight, with all settings maxed out (now bear in mind I have all the PAI Airlines installed) and I was getting frame rates in the region of 66/71/77 in the Cockpit view, and in the external view I was getting around 35 to 40.
Having said that the Flight Video frame rates were the same on playback (but I suppose that's normal/forgive me if I talk crap but I don't really understand much about the technical side of PC's! lol), although the scenary was still shaking as I watched my flight.
My question here is if I were to uninstall the PAI packages, and just download a few aircraft of my choice, does the Sim use those as AI Aircraft, aswell as me being able to fly them? I'm just thinking of how to stop the scenary from shaking during playback. I stress though that I don't really want to get rid of the PAI as its terrific, but if it has to be it has to be
As you all probably know I've been complaining about the Flight Video playback being jerky, well I've been experimenting, I have now turned my resoloution down to 800x600, and play the Sim like that too, now just for curiosity only, I took a flight, with all settings maxed out (now bear in mind I have all the PAI Airlines installed) and I was getting frame rates in the region of 66/71/77 in the Cockpit view, and in the external view I was getting around 35 to 40.
Having said that the Flight Video frame rates were the same on playback (but I suppose that's normal/forgive me if I talk crap but I don't really understand much about the technical side of PC's! lol), although the scenary was still shaking as I watched my flight.
My question here is if I were to uninstall the PAI packages, and just download a few aircraft of my choice, does the Sim use those as AI Aircraft, aswell as me being able to fly them? I'm just thinking of how to stop the scenary from shaking during playback. I stress though that I don't really want to get rid of the PAI as its terrific, but if it has to be it has to be