Eugene1:

If the re-encoding in V16 would be as clean as in V15, it would not be as big a problem and could be tolerated.

This is a known problem and it is being worked on. 

Eugene1:

But apparently nothing that will burn a 60P BD., including Sony Vegas,(I tried it) even though Sony makes claims to that effect.

The Blu-Ray specification has only recently been amended to allow 1920x1080@50p/60p and currently only few players support it through a firmware update, but it is certainly on the "new feature shortlist". Currently, 60p disc export is only supported for AVCHD 2.