Ayrton Diablo S Pan Issue

Using the Diablos in a show where I want to be able to put the fixture at 90 degrees (or -90) and tilt from there. 

I have been sending it to 0,0 then {Pan}[90] but when tilting across the stage it is clearly off and not traveling a straight path. 

Anyone have an idea? I can't tell if it is a fixture problem or a profile problem 

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