Found this thread via the bug tracker.
Hair is hard to render. You never see any art containing hair on this site.
A few thoughts and resources you can try:
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I’m pretty sure you can bake the hair animation in iClone and then export it over. I think there’s a project settings that allows for this.
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Make sure you include “Game overrides” in MRQ. This adds a number of high quality Cvars for rendering and cinematics.
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Check this out: Rendering Hair & Fur | Epic Developer Community (epicgames.com)
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Have you looked at p.ChaosCloth.UseTimeStepSmoothing 1 CVar? It worked for cloth going nuts when using temporal samples and I think someone said it worked for hair too, but can’t confirm.
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32 temporal samples seems like a lot for motion blur. Have you tried lowering that number and mixing it with spatial samples?