3feathers....
the 160 gr heads will probably be 170 - 175 before sharpening. I've loved them for years and shot game with them, but now I prefer the 140 gr. 5/16 heads....they fit fine on an 11/32 shaft, are 1" x 3", smaller ferrule for sharpening ease, and I can add lead weight in the ferrule to fine tune my arrow spines.
For those 160 heads....I would up the spine of your arrows at least 5# or cut them back 1". For every 25 gr. over 125 gr. that you add to the head, you decrease your spine 5#.