It’s not hope, I knew I needed to multiple the timeline value by around 8.5-9 and tried values around all around the 8.6 - 8.8 range and 8.72 produced the most accurate results with the least amount of overshoot and undershoot.
I’ll give your suggestion a go, but I’m still going to be approximating the rotation multiplication value and hope Epic can resolve the Set Rotation issue itself.