well it does come down to luck at some point. The drop rates are probably equal but that does't mean you can't roll the dice and get 6 6s back to back. That's just how random works. I'm sure if you got 1000 feet things would end up averaging out much more than your 5-10

however i think it would be nice if you could maybe wear all your other +2 items and get a boost in the feet if that's the only non +2 item on you, as you solo, duo, trio. etcetra.