Joe,
Working with the Super Snap in RR-Track, I discovered that the 60° cross won't work with the O30 curves. O42 SS curves are in 15° & 30° sections. You could cut a section of O30 in the center and create or purchase 4- O42 curves. See attached.
Anyhow, still pondering...
PS - Use Lionel O31 and a Ross (RCS) 60° in SCARM if you want to work on something.