Hey Matt,
Did you ever solve this? It sounds to me like you are experiencing the classic fixed-caliper "pad knock back" problem. It causes the pads to have to travel back to the disc and feels like your description. Wilwoods are known for this, especially with a stock rear end. C-clip eliminators help by reducing axle run out but for most people only a floating caliper or a full-floater rear end solves it.
Kevin Murray
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