If you're using the tach signal (which is prefered) The correct setting should be divided by 2 for a 2 rotor rotary. (has the same tach signal as a 4 cyl engine)
The flow maps are based on a percentage of full flow. I'm pretty sure you can only use whole numbers. 0 would be 0% flow(no water flow). 50 would be 50% flow. How much flow that actually is depends on the injection mode you chose. (map vs rpm, map vs tps, map based, tps based*) and 100 would be 100% flow. (full open)
*Some modes are based off the cars fuel injector duty. The percent displayed in the WIC table is a percent of the fuel injector duty cycle. Example: WIC Table shows 80% and the measured fuel injection duty is 50% the WIC flow would be 80% of 50% = 60% of the maximum flow.
Do you have the user manual? It explains everything.
Manual, software and firmware can be found
Here
Sofware screen shots
PS where in TX are you getting the car tuned?