Dave_YVR

In FSX and p3d AI parking radius is defined within the Aircraft.cfg's wing_span = entry.
 
 Here's one of a few good sites to get the correct data from.   http://www.flightsim2004-fanatics.com/FlightSim/FSXWingSpanValues.htm

Sounds like you need to try out GSX. Pushback is perfect on the taxiline every time (baring being stuffed in tight corners etc).

You will also most likely be horribly disappointed with the difference. The models and repaints in Traffic360 simply don't compare.
 
 Removing the WOAI traffic is pretty simple, as stated above the scenery/world/scenery folder holds the traffic bgl's and yes if you have the AI aircraft in your \Sim Objects\Airplane folder just delete them. That's all there is to it.

It's designed simply to move the AI more efficiently. The AI engine just can't handle the number of AI we throw at it, so people found the CW method as a way to trick the sim.

No need for 16gb of ram as you wont notice any improvement in FSX. Put the money towards a newer motherboard if your current one doesn't support AM3+ or a videocard as the GTX260 while fine in it's day isn't helping you much in FSX.