Hey all- 40 nanometers is indeed 'pretty damn tight'. I use a good torque wrench when really necessary but for this I just don't bother. I've wrenched bikes for like 14 years. Put the spline tool in and secure with a skewer, put a 15" crescent on it and tighten 'pretty damn tight', which usually is about 1/2 turn maximum after hand tight. Done. All parts greased and NEVER an issue with removal.
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"I tell you, We are here on earth to fart around, and don't let anybody tell you any different." - Kurt Vonnegut jr.