Happy to help and glad that you're not blowing dough on something that wouldn't help anyway. Learning to gauge hills and anticipating shifts is far cheaper and more effective than wasting dough.

This might also help.

On steep and fast changing hills, like the classic down/up valley, save your energy by coasting most of the way down taking what nature gives you, then begin a sprint near the bottom so you hit the climb at max speed having used minimum energy. then shift the chainrings early in the shift sequence (in some cases as the 1st shift) while your cadence is high and load is low. Then use the rear for the balance of the shift sequence.

OR if you've gauged that you can finish the climb without shifting (even if it means riding crossed over) leave the front on the outer and use the rear only during the climb (this is most useful if you know the course.

For slow starts on steep hills where there's little chance of high speed/low load cadence use the inner from the beginning, even if crossed over, to avoid the shift later.