Orygun and Bill - I was trying to say what you just said in my post where I described the TP vs PP curve as parabolic. A slow rate of increase in TP at first, but climbing more rapidly at upper PP values until reaching the same (rates?) or TP values as happens in Drive.
And yes, this seems like a perfectly reasonable design strategy.
I probably should have tried to include a graph describing the effect, but I needed to do some work on the trees in our property.
- Jack
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