Correcting light positioning

[FlipC]

3D View does not show correct light positions for given value compared to real world.
Example
Chauvet Q-SPot 260s Hanging.
Real World / 3D View
0 = Forward Up. (Light Start)
20 - straight ahead / 44
115 - straight down / 129
210 - straight back / 214
As you see, in 3D view these are all off by a value of 85.

Anyway to correct this?
Note I have checked Fixture - Edit Fixture- 3D View 540 x 270 Pan/Tilt.

[support]

This fixture was discontinued 10 years ago and we are unfortunately not able to get any information on it.
Sorry for that.
We suspect that the max amplitudes are not exactly 540x270°.
We suggest you to test with different max amplitudes.