There's a 3 level range in damage effectiveness so 28/29 -31 would have nearly equal opportunity against each other. The next factor is guns, doesn't matter what level you are, if your gun is maxed youre gonna do some damage!
I played with my hunter at 25 earlier, I went up against 30/31 and could win because of maxed guns but I was -blam!-ed if they got a couple of good shots in because my armour is weak.
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my timurs lash hits 96s on 31s so still takes 3 shots. hits 109s on 26s so really they have no chance. i can kill them with just a head shot and body shot. although with my luck in the chamber ive seen it hit as high as 137