Maybe you can also send us some pictures/video where we can see how the unit is installed on the injection machine. Maybe we can see some way to improve on it.
I can not imagine that you still use the GLXC. Because the output of the GLXC is +/- 1.6gr/s. I think that it is probably the GXC.
I wait for the video/photos, to see if it can help us.