We all know that inside, for whatever reason, seems to be the most problematic when including deflection in the aiming equation. But, you make a good point. I don't even mention outside english at all.
As for that...the only time I noticed a lack of deflection was when I was pretty close to a ball and had to use outside to get on the next one. Normally, I'd have to aim a little thinner to take into account the cb will deflect towards a thicker hit because of the outside. I almost never do that accurately, and honestly, i didn't even consider the shaft difference. I only know it worked because i made the ball; a ball which I almost always miss then wonder why, then realize it was deflection... but i never remember that shot for some reason.
For another example, I love this soft stroke shot: object about a ball off the rail, 1st diamond near the corner, cb opposite rail 3rd diamond... cut ball into the corner, use draw/outside to get passed opposite side pocket.
when i shot that with my stock shaft, i made the shot often enough - but i did so because i spun it in, instead of cutting it on. with the ob classic, when i first tried it, i over cut (cut+spin) the ball straight down the table. once i adjusted my aim to the true contact point, instead of the deflection-aim-point, the shot went as planned.
I plan on getting some more table-time tonight, so maybe i'll bring my video cam and set up some very standard and easy to demonstrate deflection tests.