Turning it down makes your shakes look smaller, so you aren't fighting your own shakes and creating more problems. It also feels more steady which helps you shoot with confidence, IMO that is important. I once shot a bull moose from a moving canoe (drifting and spinning in a swift current) at 50 yards with my scope at 7x, I shot a deer offhand at over 150 yards with a scope set at 9x... I can sure do it but in either of those cases I would been more comfortable with the scope set as low as it would go. With the moose I would have rather had irons.