Lustr 11 for a cyc

I will be designing a show this fall in a venue that has Selador Vivid-R cyc lights, 10 units (20 total) evenly spaced across a 30' wide x 15' tall cyc, top and bottom; I don't know what lenses they're using.  When I tried to put a blue wash on the cyc (for a sky), I could not get a wash that looked particularly blue nor attractive.  I noticed a lot of dust on the ground row fixtures, but I don't think that's the problem.  How should these be configured for the best look.  I've seen Seladors do a good job, but these aren't working for me.  Any suggestions what to look for would be appreciated.  They're controlled by an Ion patched as Lustr 11.  I think they are about two years old.

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