This is a very simple question, but I think it may end up with a quite complex discussion on the benefits of each starting point.
Personally, I've pretty much tried starting the PCI at every point imaginable. Initially, I would always protect the inside of the plate (especially inside fastballs) by starting the PCI on the inside, usually a bit closer to high and inside. This year I've mostly started the PCI based on the pitcher's handedness - on the same side as the pitcher's hand - and at the level of the release point. It has its perks but certain pitches are still difficult to get to and I find myself especially struggling with low and inside heat and sliders that tunnel well with fastballs.
The other day, I was watching Trumanation play and was really impressed with how he hit. He essentially starts the PCI at the very top of the zone from where he then reacts low if necessary. Thinking about giving his approach a shot now.
Where do you start your PCI and with which pitches do you then struggle with?