okay. I am an over-attentive weenie. I just spent five minutes comparing the fluted and the non-fluted, and have just about convinced myself that the stress riser point where the spider arm joins the crank arm has been moved outward, toward the pedal hole, on the fluteless crank. Does someone have both types so that they can confirm that?

If, in fact, this is the case then these fluteless cranks would certainly be the ones to have, with your ultimate SR setup.