Ple-Sen
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Sniper: +50% to Perception when using ranged weapons (x3).
Nebok, Perception is already heavily invested in by archers. They also have a skill that gives a bonus to accuracy. And you're giving them an additional skill for accuracy. Look for yourself:
An average non-archer will likely have no more than 20 Perception (10 evasion). An archer will have three times more accuracy, even without the perk. And with it, archers won't really need to invest in Perception, as they will almost always hit.
Added 1 minute ago
Although, with religion, the build is excellent for the Drow...