Make sure you consider ALL the options....
Most of the time you would be fine...although you don't 'need' that much weight to blow through a deer if your head is sharp and you arrow is flying true.
However, on alert deer, or hunting over feeders in TX then I'd say yes, TOO HEAVY. Believe it or not, sometimes more speed is better.
Even though I tried to convey this every year to the attendees that have never been to our annual TX hunt....one guy showed up a few years ago with 720 grain arrows out of a bow about your weight....he missed 20 animals (hogs and deer) before he finally hit one....in the butt.
By the time his arrows got to their mark, the critters had been in Oklahoma for 2 weeks. So, at times, it IS possible to have an arrow too heavy for deer.
Heavier is good, but not ALWAYS better.....sometimes speed IS your friend.
When I go to TX...I use a lighter arrow than I do elsewhere.