Well that all depends. I also bench with my ring finger on the ring when doing ME work. The wider you go the more you are using chest and less tri's - the closer you go, vice versa. I have found that if I go wider than the ring on the ring, its harder to tuck my elbows to minimize shoulder rotation. I am of the opinion that the less shoulder rotation you have, the better for your shoulder it is (esp. w/ max effort pressing), thus the longer you can bench heavy without injury. That doesn't mean that you can't go wider, but I believe that you should generally be more careful with the weight and the movement if you go as wide as say the index on the ring. Also, I believe that the more you can incorporate your tri's in the press, the better.