Might want to look at an Easton Axis Traditional shaft. I weighs slightly less than a FMJ and is graphite rather than aluminum/graphite which will bend. FMJ will generate more momentum for penetration and is slightly straighter .001 vs .003
Go to a real bow shop- not a box store- and get properly fitted. Fitted is draw poundage and draw length; proper tuned and set up; proper length and proper spined arrows. Then start from there. Best of luck.