The biggest difference between STG1 and STG2 gearbox flash is the amount of torque reduction that happens in between shifts. STG1 still uses moderate amount of torque reduction to cut torque during shifts, but STG2 barely has any. The less torque reduction during shifting leads to a bit more stress on internal components, mainly the input shaft/bearing.
Yes for a setup like the one you mentioned, a STG1 trans flash is the best option.
That has not been added or addressed yet since its not about shifting speed but actual torque increase to get engine up to the correct RPM. That is the delay you are feeling.
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