Use five values you can observe
Current Power and target Power define the remaining gap. Observed Power per action comes from a short controlled sample. Sustainable actions per second should reflect a pace you can keep, not a one-second burst. The optional multiplier belongs only when the live UI shows it and your observed gain has not already included it. Leaving an uncertain multiplier at one is more honest than double-counting a boost.
Check current in-game values after an update.