Go-Arounds

At busy airports, I've noticed that a lot of AI traffic has to make go arounds when landing. Its usually because the plane that landed in front of it is slow in getting off the runway. Is there a way to make the AI get off the runway quicker? I really don't want to decrease the traffic percentage. For example, as I was landing at SFO, ATC told me to go around because the 737 infront of me was still on the runway. When I finally started my second approach(30+ minutes later) there was another plane fairly close in front of me, and I probably would have had to do another go around if I hadn't slewed my plane a couple miles back(I wasn't going to spend another half an hour to forty five minutes going around) I probably would have had to do another one. BTW, I'm not using any addon AI flightplans or AI aircraft.Edit: This is in FS9.