May I add a comment about accuracy as you have described it.
In a true life and death situation, which is just about the only type where deadly force is to be used, one's fine motor skills are just about destroyed. While you may be able to accurately "...shoot a pretty fair group ..." that is probably not an indication of what you might be able to do in a life and death situation unless you do some fairly extreme practice.
Furthermore, most true life and death gun fights occur at fairly shot range and involve few shots, so range "group size" is even less of an issue.
Having said all of this, as long as the penetration is "reasonable" (i.e. meets say the FBI penetration test) I would opt for the more accurate round myself, but only after I was sure the penetration was "reasonable." Since I think you have posted your penetration thoughts on this round previously (if I remember correctly), I would say you are making the right choice.