I didn't understand the nature of the car on spikes I guess you can say as to understand the zeroed out areas are areas of no control so causing that spike. Now to understand a table completely is essential to being able to make correct adjustments. So looking at my prop table or any other it will have an obvious value of rpm and then to me at least not obvious value pressure delta starting at a negative and increasing to a positive of 4.4 I believe not in front of me at moment. So how to relate the pressure delta to kpa or boost value is my oy way to understand it as I have no clue how pressure delta is related at all. A lot of tables are using this and must be very important and probably some calculation on barometer and kpa to come up with the pressure delta? This is where the greater knowledge of your guys really comes in handy. I have a lot of tables that once I figure this out as even my dc waste gate table uses this on left column so knowing this will help me a ton on so much and guess should have asked this much sooner but thought I had it figured out until some settings didn't fall in line to my logs on kpa so threw that math out the window.