I'm trying to figure out if, at 50 lbs., would a lighter arrow do better than a heavy arrow? The bow is a 2011 PSE Vendetta XS with a 26" draw. As of right now she is shooting arrows that are about 4" to long that weigh in at 375 grains. I'd like to see her shooting something lighter. I mean, technically, she could safely shoot an arrow that weighs 250 grains and that would gain her gobs of speed but will it get the job done with our big Nebraska deer? What do you guys, and gals think?