Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
Your base fuel rate seems reasonable to me. #6 is definitely adding enough fuel to be a concern. What led you to look at the balance rates? Contribution, misfire codes? Exhaust smoke?
Doing one injector is fine, but doing them all is preferred. If it's your truck, feel free to FAFO. :silly: If it's for a customer, push for all injectors. Do a relative compression test before calling the injector to make sure there isn't an engine mechanical problem causing the PCM to compensate with the balance rate.