Sounds like you wasted two days on a simple fix. Should have pulled the seal first, that's basic troubleshooting.

Absolute no-brainer on the cab-off. Did the same job on a 6.7 last month. Pulling the engine is a total fight. Once the cab is up, everything is right there. You can actually see what you're doing. Saves your back, too. That open space is worth the extra few hours of lift time.

Yeah, that jump in precision with a joystick is real. It took me a solid week to stop overcorrecting, but now I wouldn't go back.