Pastor Steve,
I like a heavy arrow. Just a personal choice. I think Lisa (my wife) is shooting about 12 grains of arrow weight to pound of bow weight. Her arrows are in the 550 grain region. That's finished arrow with point, fletch and nock.
Her draw weight is shorter than yours is though. She shoots a 26" arrow, so she is actually pulling less than 45lbs.
I shoot an arrow that is in the 600-625 grain weight. Not a real heavy weight by some standards. I have some finished wood arrows made with ash shafts that came out about 775 or 800 grains. Now, those are heavy weights.
I figure you are using either 125 or 150 grain heads. 345 grains just seems kinda light for an arrow shaft. If your shaft is 470 before you mount a broadhead, your looking at 600 to 625 grains. That would be good for me.
As long as you make a good shot, at a reasonable distance, you're in good shape.
I give Lisa a hard time about shooting "lawn darts" out of her bow. They look tiny next to my 32" shafts (plus heads and nocks, they are more like 36"), but they still work just fine. Her arrow blew all they way through this turkey stem to stern and protruded from the front about four inches.
Good luck with your hunting!
OkKeith