You have two choices: cut down on the number of brushes in your map, or don't add bot support. You can try putting clip brushes around heavily detailed brush work, but no guarantees that it will work.
Clipping heavily detailed brushes/patches has not worked. Removing or simplifying heavily detailed brushes/patches has not worked.
What should I do? Is there a better bspc.exe than version 2.1? Should I be using a different program for this?