I've tried running a couple searches on bench grip for powerlifting training, but I am still confused on how wide your grip should be. Below is an image (not the best, but you are just able to see the smooth rings)

Currently, my index finger is on the smooth ring for wide bench, is this too wide (for maxing and doing low reps)?

I've gone from having my pinky on the smooth ring, to my middle finger on the smooth ring, to finally my current position which is index finger on smooth ring.