Roger,
The diagrams are not based on my "theories." They are based on physics facts. And the physics facts can explain all observed effects.
In the context of most of my squirt resources, "tip offset" refers to how far the tip contact point is from the center of the CB in the horizontal direction (left or right). I'm a bit confused by your use of "latitudinal" and "longitudinal" offset. To me, a latitudinal offset would imply a vertical tip offset since changes in latitude correspond to north/south motion. It seems like by "latitudinal" you meant moving across lines of latitude (in the longitudinal direction). Regardless, I think I know what you mean. However, let's use "left/right" and "up/down" to correspond to horizontal vs. vertical tip motion.
Getting back to the point, squirt (initial CB deflection) increases with both horizontal tip offset and with shaft endmass. Proof and video demonstrations of these facts can be found here:
Now, with most shots at a pool table, the cue isn't perfectly level, therefore the CB also swerves (after it squirts), which acts in the opposition direction as squirt. Here's a video demo clearly explaining and illustrating the different effects:
Now, as Jal has pointed out earlier (and as I think you are suggesting), there is less squirt when the tip contact point is above or below center. For more info, see:
However, with any shot where the tip is not on the vertical centerline of the CB, there will be squirt. There will also be swerve if the cue is not perfectly level (which is almost never the case at a pool table).
Now with topspin shots, the swerve happens very quickly, especially at slow speed. The amount of squirt can be very small (especially with a small amount of sidespin and a low-squirt cue), and the swerve can happen very quickly and cancel the squirt. In this case, it could appear like the CB is going in a straight line immediately off the tip. The squirt is too small to see over a short distance and the small amount of swerve happens too quickly to notice. However, the effects would become more noticeable with more sidespin and faster speed. Added cue elevation would also make the swerve effect more noticeable.
I don't deny your results. Again, for a given amount of endmass, and for a given amount of sidespin, and for a given speed, the swerve can exactly cancel the squirt (i.e., there will be no net CB deflection from the aiming line), and the swerve can happen so quickly (e.g., over a couple of inches) that neither the squirt nor swerve would be noticeable.
Results would definitely vary with amount of left/right tip offset (more squirt and more swerve), cue endmass (more squirt), shot speed (delayed swerve), cue elevation (more swerve), and cloth conditions (delayed swerve with slicker cloth).
It is very easy to demonstrate all of these real effects.
Regards,
Dave