KPower Performance Test: Troubleshooting Guide

I would like to purchase the test set offered here.
Okay, I've downloaded it now so I can try it out.

Can my opinion ever be correct, or am I doing something wrong?

I equipped my VW Golf TDI 130HP with a power box (genuine SPEED-Buster).
The performance test resulted in 138 kW (in 4th gear), which is already the average value, as I drove the route twice in both directions to avoid any minor inclines at the end.
It's not that difficult once you've made sure the inputs are correct.

My question is now, can the result be correct?
However, only 127 kW was measured in 3rd gear.

Hello.
The data seems reasonable for my case. There are two very sensitive inputs: on the one hand, the vehicle weight, and on the other hand, the tires. The weight actually matters down to a few kilograms, and the tire circumference also significantly affects the result. Try experimenting with these data and check the plausibility.
Best regards, Heri.

I was able to determine the weight very precisely.
"Only the tire size is not specified. A value of 1.00 is given, but I don't know what to do with it, since the rolling circumference is usually around 1800-2100?"
Therefore, I kept the value, but I'm wondering if the performance will be reduced.
I have 225/45/17 tires on.

I've heard that diesel engines from VW supposedly have 5-10 horsepower more than advertised, but I'm not sure if that's true.