Hi Sebastian,
.02 for the display angle? Yes, this would be overkill. 5 would still be quite high. I think MoI's default is 10 but i work at a lower angle too, but I am not loading 600 mb files.

The mesh angle will not affect accuracy at all. It's just what your looking at in the MoI viewport. If you set to coarse, then zoom way in, you would have to learn to trust the numbers and add some other techniques to model accuratly, because at the higher zoom level, things can start to appear "off" from what they actually are.

5 has got you going, but dont be afraid to try working at 10 (10 would still be better than "most other systems")