You still haven't specified if the CB should be rolling or stunned (no roll) on impact with the OB. Because there is no clarification, I'm assuming you think it doesn't matter if the CB is hit with natural roll or stun (as long as the shot is hit on the CB's vertical axis).
I'm guessing you're a somewhat advanced player (if you label yourself a 14.1 addict). If that's the case, I can pretty much guarantee that don't stun the CB with center ball on the (vast) majority of your cut shots. Either you hit the CB with natural roll, or if you do stun the CB you're applying a dose of outside english (and you probably are not even aware of it).
I guess my point is that there actually is (or should be) a wrong answer to the question. And that answer is shooting the CB with center ball STUN.
jsp:
If you have to ask, I'm an Open-level player and 100+ ball runner. No, I am completely aware of any spin I put on the cue ball, and I don't use "helper" english if I don't need it. Didn't you read the part where I say that I've seen too many people overspin this shot, into the unprofessional side of the pocket and sell-out to his/her opponent? I've personally done that in the past. And I see others do this all day long.
If you must know, I'd most likely hit this shot center ball (cue ball vertical axis-wise), with a touch of draw, and I'd hit it firm (i.e. draw takes effect after contact, to keep the cue ball away from that upper righthand corner pocket in the WEI table diagram).
I really do think you're making this shot W-A-Y too analytical. To address your question head-on: does center stun make a difference, and is it something you'd want to avoid? Yes. Like the good doctor says, "don't do that."
Satisfied?
-Sean