Should the "insubordination" issue be alleged, I think the approach to take with UI is to leave the disagreements about quality out of it and to explain, "I was doing the work as assigned, and it took me (X) minutes to properly complete the job. My boss thought it should take (Y) minutes. Although I was able to complete the work in a professional manner, despite my best effort I was not able to complete the job within (Y) minutes."

