Brian,

For what it is worth I am equally confused.

I played around with spx in both 1.12 and sedan.

I noticed a large improvement in power/lap time at about 74mm rollout with lrp motor 17.5 in 1/12 on setting 8. The lrp motor always felt like it ran a bit flat with a regular comp.

Yet with 17.5 duo motor in rubber sedan I noticed no actual difference in all different setting and rollout going up and down +/- 5 teeth and ran basically same lap times not matter what.

More I am playing around with brushless I am starting to question power difference relating more in motor variance than anything else.