How do I correct this, or am I due for an upgrade?
When I use the Iris enhance i'm no longer able to use clarity,saturation,tone,tint etc... why?
Why not? The Iris Enhance Preset sets the brush to Exposure +0.35, Clarity +10 and Saturation +40. If you want additional adjustments on the same brush or different values for the three preset parameters, just move the sliders.
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