Originally Posted by craydds
Front for dive has everything to do with spring rates and preload (setting laden sag height) and nothing to do with fork oil weight.
You forgot oil level/height, which has the most influence when it comes to anti-dive from braking loads.
And.... if the OP likes it with 10-40, so be it. It's his ride, and he may or may not settle on something different, after the usual experimentation.