Nub is correct, it all depends on how picky you are. I dont mind hitting a little low, 1" to 1 1/2" , at 20 yrds. Helps, in my mind, when using the 20 yrd pin for a 10 yrd shot. I do like to be dead on at 30 and 40 yrds.

I would not complain to much if I hit 1" low at 40.

If shooting a little low was bothering me, I would move the pin bracket as a whole to bring all 3 up instead of increasing poundage. But, 70# is a little more than I like to pull back with comfort.