Don't confuse grains per inch (gpi) and grains per pound (gpp). Grains per inch is what the bare shaft weighs per inch. Grains per pound is the ratio of arrow weight in grains to bow draw weight in pounds.
You'll be drawing about 42# at your 29-inch draw. If you hang about 250 grains on the front of the arrow, you'll end up with an arrow about 520 grains, about 12 plus grains per pound of bow weight and plenty heavy for deer size critters.
With that much weight up front, and the little extra draw length, i.e., 29 inches, the .500s will very likely work.
You can get that weight up front with some combination of insert, adaptor and broadhead weight. For example, with a 125 grain head, can use a 25 grain insert and a 100 grain adaptor, or a 50 grain insert and 75 grain adaptor. BTW, 250 grains up front on a carbon arrow really isn't a lot. Some folks put 300-400 grains up front for extreme FOC.