Yeah and built my character on the FO3 unstopable VATS sniper build too.
In this game snip in free aim, when you use VATS wait for them to get up close and invest a lot in critical boosts and AP.
Totally, Finesse, Better Crits, Action Boy etc. are the way to go. Built to Destroy and Kamikaze too.
The trouble is, free-aim sniping is incredibly powerful (Quarry Juction holds no fear for a sniper whatsoever), but it makes the combat too much like a straight-up FPS. That's why I loved VATS, it was a wonderful compromise between real-time and turn-based combat. Plus it looked incredibly stylish. It needed re-balancing, like I say primarily because of the insanse DR, but NV has reduced it to the 'panic button' for creatures that get into melee range.