Gpu Block and bits

Hello, im curently in the design and mill phase of my gpu block.
Here is what i have/plan.



I have the two larger channels cut. Next monday i plan on doing the inner channels, my question is. Should I try and use a
1/16 bit or stick with the 1/8? is it worth it to have smaller channels? Another thing that worries me is how easy it will be to break the bit.

Bits break all the time.
Take ur time and stick with ur design.

Let us know how it goes.
G/L