Solidworks Bend Table Help

Hello, I need assistance in setting up a custom Solidworks bend table for Aluminum Air Bending using Bend Deductions. I have bent some strips of sheet metal at various angles from 15 degrees to 135 degrees. However, I don't understand exactly how to set up the Bend Table itself. Is the radius value the inner or outer radius? Is it measured or a function of the die/punch? What is the best way to measure the actual bend deductions from the strips? I tried a couple methods but achieved very varied results, specifically on the 15 and 30 deg strips. At the very least, the bend deduction values should follow a linear pattern right? Any insight or guidance on this process would be greatly appreciated, as I haven't been able to find much online.