Int CRS to CF
I have flown 737, 767, 747 and 777 among other aircraft and my recollection is that it behaves a little differently on all of them depending on software update and system hardware status.
One thing I am sure of is that the vnav path is correct only when you are intercepting the final approach OUTSIDE of the waypoint that you have selected for the intercept course.
So if you are flying a visual approach or are being vectored and intercept inside that waypoint and use VNAV you will end up high.
Using any waypoint inside of your anticipated intercept point is the way to go. Sometimes that will be the CF waypoint and sometimes something closer.
Later model aircraft make a better job of the VNAV PATH calculations than the earlier versions.