Kevin, if you can get an MTH ALP-46 at a good price, then try it on your curves and if ... if ... you get a problem use MTH's useful comments and cut/file away as much of the skirt as you need to. As a 2-railer I'll probably get shouted at for saying so, but enjoying 3-rail is about getting O-gauge empires in tight spaces. Hardly anyone seems to look at those details nearer the track and maybe you'll be the only 3-railer showing the fix!
Jason