You can roll into the following file:
C:\Users\[Username]\Documents\My Games\Zero-K\AI\skirmish\DevCircuitAIBrutal64\stable\config\factory.json
And change the following field of any given factory:
// Define factories
"factory": {
"factorycloak": {
"importance": [0.78, 0.2],
To read something 10x higher, eg.
// Define factories
"factory": {
"factorycloak": {
"importance": [10.78, 0.2],
The first value is 1st fac choice. the 2nd value is 2nd+ fac choice. Probability is affected by map size and terrain, but at 10x higher than normal you'll get it every time on a non-sea map.
EZ