What do you mean by harvest? if you mean take profits early or partially close the position, I never do this, as its generally counter productive and actually turns out to be a false economy.
As you will have seen I do pull up the stop to break even at a certain point [that is decided by my system], so there is no risk of loss, but never close early or take profits early etc. I believe that the stop loss and profit limit should be placed with validity and therefore the PL is only in validated when the SL is hit.
‘Potential’ traders that close trades because the price action is near a SL or PL will always end up fighting themselves.
If a trader considers closing a trade shy of a PL then why wasn’t the PL closer or in the position hes about the close in?? it just doesn’t make sense.
If you have spent the time creating a profitable system, never second guess it.
Hope that helps.