That's average 3points, are you taking commison (which is usually 0.5 tick value of the product) and spread into account? If not, then your average stop is 3.75 point (nearly 4points NQ), right?
what's the danger of setting it at 20 ? seems to me, that it's the only way to go. oh and I'm a total noob, so don't take it as advice, but as a question.