Okay, so I'm replying to answer my own question, but I recieved a direct response from an NI applications engineer this morning.
Basically, RFSA and RFSG are "not supported" in LV 8.0, although they do "work." That is, the install will fail (without telling you), but the VIs are fine. You need to copy the libraries over from LV 7.1 to 8.0 and all is well. They will have it fixed in the next couple of months.