Always write/code like normal when you want to lower (17 positive), and always write/code when you want to rise (-17 minus).

But you need a pen and a papel to write down the number, to do exactlly the correct measurment, so all wheels to be the same (left rear with right rear, and left front the same with right front)....i mean, when i lower mine, was like this lf16,5/ rf17, lr19,5/ rr21.

Hope you understand what i'm saying, good luck 👍