Just to prove a point, a couple - three years ago, Chris Spikes (Landshark 160) killed either seven or eight deer, don't exactly remember, while shooting a 45# recurve, drawn to 28", an arrow weighing 450 grains, tipped with a tree shark. Complete pass thru on all, except one, a deflection, I believe hit the deer in it's neck, and still killed it.
If your mind won't allow to be comfortable enough to shoot a tree shark, you might want to take a look at the tiger sharks. They are 1 9/16", and fly great.