Hi - Are you saying you can’t control the rotation? I notice your getactorlocation is not connected.
The controller controls the pawn, I - think - you’ll find if you try and affect pawn rotation directly with the pawn it wont work ( could be wrong ).
If you use a spline along the middle of the track, you can always let them do what they want, but you always know where to pull them back to. You don’t have to worry about ‘crawl’ where the coordinates gradually get more errors over time.
On the spline, you can let them do as much Z as they like, but get a grip on the XY.