Your sister is 24, she just thinks everything you do is lame.

Ran into this exact thing at a shop I worked at in Toledo. We had a service writer who would pull the book time and then tack on extra for trucks if he knew the job was gonna fight us, but that was his call and it varied by who was at the desk. Some guys got the bump, some didn't, and it caused a lot of bad blood on the floor. What actually helped was keeping a log of every truck job that ran over, with photos of the rusted bolts and the extra time it ate, then showing the owner a month of it. Once he saw the pattern in black and white he started adding .3 or .4 to the heavier stuff. The labor guide companies won't change anything for one shop, but the guy signing your check can.