How do I create a smooth rainbow effect for my Lustr X8's?

I have Lustr X8's in Direct mode. How do I create a smooth rainbow effect for them? Currently I always see a jump in colors when transitioning through red. I've tried making an absolute effect with hue 0 fading to and through hue 360, also the same concept but via a linear effect, as well as a color effect with a circle pattern smashed together on the saturation axis.

How do I makes this effect while using all the emitters in the fixture? Hopefully this is possible in a way that works for my other ETC fixtures and my RJ Dalis. 

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