Here's my Pitch Window Method for stability. Suppose you come to a string and you have to lower the pitch a tiny bit. The first thing I do is assume that the NSL tension is near the bottom of the tension band that produces stability. Now, what I do is a gentle flex of the pin in the direction of the string. This flex has to be very small because we don't want to damage the pin block. Now, if the pitch does not go down, that means the NSL tension was not near the bottom of the tension band. So, that means that the target pitch is not available to us for the pin foot orientation that the pin currently has.  So, I need to turn the pin foot by the smallest amount possible, and I have to do this without having a change in the pitch. If I can get the pin foot to move, without having a change in the pitch, that means that the NSL tension now must be lower in the tension band. Now, I will try the gentle flex in the direction of the string and hope that the pitch will drop by the smallest amount that I'm looking for. If the pitch does not change, then I must do a very small nudge of the pin foot again and repeat the flex. Using this method of flex, move the pin foot, flex, move the pin foot, I am able to make a very small change in the pitch and also know where the NSL tension is and therefore leave it slightly high of middle so that I can have good stability. I hope that helps. If you have any questions, don't hesitate to ask for clarification. Note: it is the unbending or unflexing of the pin that puts the tension back into the nonspeaking length. If the nonspeaking length is very long, then the unflexing will not put very much tension back into the nonspeaking length, and the string may be unstable. If the nonspeaking length is very short, then the unflexing actually might put so much tension back into the non-speaking length that the pitch actually rises! This is called Hooke's Law.