Hi Paul --
I'm glad to hear you got your PSC Harps. I don't have any experience with the South Park version, but I do have some of the D&RG style on my RGS Telluride Branch layout. After some trial and error, I found I needed to relocate the pivot hole on the staff to get them to operate properly with my Fast Tracks turnouts. Let me know if you need more info, and good luck!
Geoff Hamway