I find that both heavier arrows (12gpp at least) and thicker strings (at least two more than recommended for yer draw weight) - I like the little bit of stretch offered by the polyester (Dacron) type, coupled with a lowered brace height (for most of my longbows that'll be 6-1/2" to 6-3/4'), and some added string silencers (plug here for Terry's New Zealand wool Bow Hush) pretty much do the trick for all my longbows (I don't use recurves). Shooting form and arrow flight are important, too - I have no bow arm string slap, no arm guard (maybe some cord to reel in a baggy shirt or jacket), and can achieve good arrow flight. But some deer, particularly of the Texas clan, can hear the release of a string off the glove or tab, and at that split second they drop down and bound out in high gear with white flag a flyin'.