Previewing HSL & Sharpening at less than 100% on Canon 1Ds MKI

Hi, I'm new here and checked the archive for this topic with no luck.
I am experiencing a degraded preview when adjusting the parameters for HSL and Sharpen/Noise tabs in ACR 4.3.1. The adjustments appear to have a grainy artifact at 66% and less but then perfectly smooth at 100% and more. Other adjustments seem fine- exposure, white balance, etc.
I thought this might be by design at first, but this only occurs with .raw images from my 1Ds Mk1. I tried opening a few Tiff's in ACR and can't recreate the artifact.
I can live without seeing accurate sharpening at less than 100%(I usually sharpen later, anyways), but making adjustments to the luminance in HSL would require seeing more of the image to make a good judgment.
Anyone else have this issue?
Thanks,
CLD

> It has been well-documented in articles on the Internet, in white papers, in online tutorials, and in books about ACR that you need to be viewing your images at at least 100% in order to accurately evaluate clarity, noise reduction and sharpening.
I believe the OP conceded that, but thought that HSL adjustments needed to be evaluated within the context of the larger picture(?)
[Caveat: I'm not yet a user of ACR4, but to my mind HSL adjustments involve color and tone, do they not? ... Or, is the OP wrong regarding not being able to see HSL changes at <100%?]

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