It looks as if Motion Smoothing is only programmed correctly in 90hz mode.
Such that it shunts to 1:3 mode at <45FPS instead of when <37.5FPS as it should in 75hz mode.
So perhaps it’s limited to an error in calculation of 1:3 motion smoothing only in 75hz mode.
Please refer to my most recent post in the original thread here - @Heliosurge is this something that can be merged with the topic Pitool has Sub-Optimal Timing: Motion Smoothing (Originally Titled: Something changed with Pitool on version .271 and forward)