Yeah, your crit things are ridiculous. And Prime hit the nail on the head. You need some sort of sniping ability at level 1. That's what my suggestion of the alteration on the precision damage range thing was. I do disagree on the move silently thing being only close, I mean, it does only really matter at close range, but it's more of a stealth thing, which a sniper is supposed to be.
So here's what I think you need to have as a general plan for the class: at level 1 you grant a sniping ability, similar to sneak attack, but designed to be more single high quality shot. This will be 1d6/level, and require a standard action. As you level, you grant bonuses to hide, move silently, and movement, much like you have, but use (ex) instead of (sp), and have them be constant abilities. As you level, grant bonuses to crits, and at around level 11 grant an additional attack as part of the sniping action. As you level grant a bonus on the attack roll for the snipe, slowly, but steadily, around +1/2 or 3 levels. Grant either dex or wis to damage (probably wis) at some earlyish level, probably around 5, and the other at level 15 or so. Capstone ability would be 1/day use a full round action to snipe, granting your sniping bonuses on every arrow and have every shot be at full BAB, possibly with another bonus to attack. Wisdom doesn't come into play unless you take Zen Archery, except as a secondary, though you can change this. Zen Archery is a terrible feat design wise though, and needs to change.
I actually have a class similar to this I did as a PrC for a Scout sniper variant, I haven't posted it yet because it's not fleshed out yet and I need to make adjustments. I was thinking of just making a class variant for the Scout and end up combining the PrC into the base class. You can still see it on the old boards, under Deepwood Sniper, and yes it's an update of the actual PrC.