I don't think your arrow is too heavy, but it does not need to be that heavy to be effective. I have been shooting carbon arrows that are 495 gr and 545 gr out of my 45 pound bow and I like the results. One of them is 11 GPP and the other is 12 GPP. But, they are very well tuned, and I find that to be important.
I got the arrow weight differences by using different brand shafts and by tuning carefully.
Get your broadheads shaving sharp and if the arrows shoot well you will be fine.