Turnout that my calculation program didn't work on a TZR125 4DL
When I manually calculated the curve it came out as suspected, very happy that I have solved my little problem.
As you can see, there is a slightly different curve visible compared with the known curve from the manual.
Around 7000rpm till 9000rpm it is off by a couple off degrees.
Draw on a peach off paper, with a nice fat line to compensate the tolerance