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The guy who mentioned using RF is completely correct.
There already exists an ability in the game to cut the evade rate in half, that is rapid fire. Few scouts know about it because I suspect its a bug rather then a intended feature, but either way, USE IT!
See branin's hunter vs. infiltrator tests for confirmation:
http://vnboards.ign.com/message.asp?topic=63376264&start=63381430
He notes assasin evade chance as going from 40% to 15%.
Happy hunting,
Ark