Sk8rsdad is 100% correct in his suggestions.
If you need to light the CYC from an above position, your only options are to raise the border above the CYC, lower the CYC lights or move them US of the border. We haven't yet learned to how to make light bend without some intermediary object such as a mirror or prism.
Move the CYC US is the best solution overall because then it can not spill on that border either. If the problem with that is then too close a proximity to the CYC for even lighting, a more opaque diffusion gel such as Rosco 114 or Apollo 1500 may be useful in evening it out and improving blending between colors/units. My favorite strong diffusion is the Apollo 1500 because it distributes light to around 170 degrees, but still allows a hot area to peak through, important when using sky CYC units because they rely on the hot area hitting the lower part of the CYC for even illumination.
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