sizzami,
The detent pressure does not come into play until you are in the return stroke.
The detent release pressure has a wide variance, why, I don't know. The pressure on the return stroke will be low pressure, around 650 psi, and at high volume, and a fast return time The only purpose of the detent is for semiautomatic mode, at the end of the stroke, just to kick the lever into neutral.
I think that new double set lever log splitter valve is a great idea, just set and forget, and have the next log ready to load. However the price on it is the kicker. about three times the standard log splitter valve.