Timing Curve on 360 in an RV

How did you pull it back. The adjustment just does the "start" of the advance with the amount of vacuum if that makes sense.
With Edelbrock’s EFI setup, initial timing, total timing, all in rpm settings, and vacuum advance are electronic and adjustable via a tablet. Not nearly as cool as swapping out springs, but it’s been handy as hell as I’ve been learning the concepts and working to get this first project dialed in.