Kevin,
I would use 0-96 or wider switch tracks even if they lead into a 0-72 curve. That is what the real railroads do, it all but eliminates derailments at the switch track and looks better with big engines and cars. That is what I am doing, the only place I use 0-72 switches is on industry tracks where you go slow and do not usually have long trains going through the switches.
Either way, best to you, I look forward to seeing your progress.
