For example, this is a graph of PT 3->4, PT 4->3, and TPS 4->3, it shows how non-100% TPS 4->3 conflicts with PT 3->4 (the blue region)
[ note that the TPS 4->3 curve is graphed on its side (i.e. rotated 90 degrees) to match the graph axes ]
in the blue region, you may or may not get the expected shift (it will be the opposite of what you determine/expect).
same concept applies to TCC apply, TCC release, and TCC TPS release.