You might think it feels that way, but the tip is in contact with the CB such a small amount of time (for any shot hit with any type of stroke by any person), that it is not possible to make any practical uses of any such difference (even if they did exist).
If you swoop into the CB, you can effectively change the aim of the shot (as with a
pre-stroke BHE pivot), and impart a little extra sideways CB motion, to compensate for CB deflection and send the CB straight. Again, this is clearly demonstrated and described in the videos and illustrations on the
swoop/swipe stroke resource page. But this has nothing to do with the incredibly-brief tip contact time (or any possible minute changes in tip contact time).
I recommend you "do your homework" and go through my resource materials. That will probably enable much more fruitful conversation (or even end it entirely).
Enjoy,
Dave