Arrow weights are all over the chart. There are arrows out there that barely weigh 1/2 ounce. There are some (for African game) that weigh two ounces. (An ounce is 454 grains)

The arrows you have arefairly heavy - at least relative to what most folks shoot for north american game with today's compound bows. They weigh over 500 grains with 100 gr. field tips. Great for penetration and large animals. And they tend to quiet down a compound bow. But you pay for it in long range trajectory. Most carbon huntingarrows are around 100 grains lighter. You should be OK shooting an arrow at least 5 grains per pound of draw weight - or 350 grains for a 70 lb. bow.