I fought with the same thing for a while. Even came up with a strategy for a tiered shift schedule (graphs looked like stair steps). It worked, but I learned something in the process. This is just my viewpoint, but it seems the SD's are far more sensitive to pedal input than road speed when it comes to shift points.
Once I took that approach, shift points became easy. Don't even have to use the tiered shift schedule anymore.
Sorry, nothing technical there. Just do what I did, and start disregarding road speed and focus on your pedal position. When you do that, start thinking about the fueling with your tunes. The more fuel you bring on early, the less throttle input you have to play with in regards to shift points.
Not sure if that makes any sense to anyone. If not, let me know and I can try to clarify.
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