TNDeerGuy, is right on the money. If you shoot a heavier head then a stiffer arrow will be needed. I shoot Aluminum arrows (2317) and I don't worry about my speed. I practice my distance guessing and keep my shots close. I honestly don't know what the speed on my arrows are. I shoot a 32" arrow. So they are heavy. My Full Metal Jackets (300) shot around 260fps with 125gr. head, 31.5 inches long. I shoot heavy poundage, my bow is about 12 years old as well.
The deer I have shot did not care that the arrow I shot them with was not going 350fps or that my Broadhead did not have a 2.5inch cutting width. They just walk/ran 30/40 yards and laid down and waited for me to come give them a ride back to my house.