RE: Is my arrow really heavy?
First off, 510 gr is BAD MEDICINE !!!!!
If your main target is deer I am not sure you really NEED that heavy of an arrow.
If you dropped down to about 430-440gr you will still have plenty of juice + the performance boost from some more speed.
I think the sweet spot for many bows is about 270 FPS and I will usually tinker with arrow weight till I get close to the 270 mark.
This has worked on many different bows and may work for you.
I also (for hunting) prefer a heavier broad head/stiffer spine combination to a lite broad head/soft spine combination.
I believe stiffer spine arrows penetrate better.