Adjusting thres and gain having no effect

[ZedGti]

Hi All

I have a Golf V Gti, have had an expert friend install the HFS 3 for me (im mechanically challenged - all i can do is drive - ) The system was working fine, however it was spraying a bit early. i attempted to adjust the threshold to spray a little later and cut down the gain so it sprays a little less. However since this any adjustments i do have no effect, the dials thres and gain turn but have no effect on the system
I am very confused now, please can someone help.
Thanks
Zed

[Richard L]

The gain will be at "x1" from the trigger point. As the IDC climbes the effect of gain will increase.

Starting IDC trigger at a higher point won't inject more, so no need to decrease it.