Hello,
The snapping increments are dependent on how you have setup your options. If you take a look at the Layout Grid option in the navigation toolbar at the bottom of your screen you should see a few things there that may be helpful.

If you choose the option to "Set Snap Value" you will be prompted with a couple different options.
One is Fixed and the other is Adaptive.
Fixed allows you to set a specific value for each snapping increment. If you are constantly using the save value this may be useful to you.
Adapative changes the snapping increment dependent on how zoomed in you are. The closer you zoom in, the smaller the value gets for snapping. This seems to be the preferred method since it allows you to zoom in to gain greater fidelity with your increments.
I hope this helps, please let us know if you have any feedback around this, we are always looking for ways to improve the product for you.
Cheers,

[Joel Palioca]
[Software QA Engineer]
Joel(dot)Palioca(at)autodesk(dot)com
Autodesk, Inc.