1816 = 9.3 gpi
1916 = 10.1 gpi
2016 = 10.6 gpi
1820 = 12.2 gpi
What this shows you is that the 1820 shaft has been designed to stand up to a lot of punishment on the practice range, teaching beginning archers. What you would like in a hunting arrow is a lighter shaft that is stiff enough to carry a heavier broadhead. I like your 2016 with a 175 grain point. That is close to ideal for you for a hunting aluminum arrow. I don't know if you bareshaft or not, but the 1916 might work even better. I can't tell you because bare shaft results change depending on the individual archer and the bow. But you are in the ballpark with either a 2016 or a 1916 with a 175 grain broadhead.
Of course, I would like to convert you to a .500 spine carbon, but there's nothing wrong with the aluminum shafts you mentioned, other than the 1820.