Mike,
You are correct that a hit slightly less than 1/2-ball is required for equal separation angle and speed. FYI, the physics/math proof can be found here:
http://billiards.colostate.edu/techn...ew/TP_A-16.pdf
This can also easily be shown at a table.
You are also correct that at faster speeds, the CB will be delayed slightly due to the time it takes for the CB to curve forward from the tangent line per the info and demos here:
http://billiards.colostate.edu/threa...ion.html#speed
Regards,
Dave