Discovered something else that might be helpful for others too.
LODSync in the MetaHuman you imported resolves any flashing or glitching hair issues.
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Open MetaHuman and copy the LODSync component.
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Paste it to your player character (where you would be using your MetaHuman assets, Torso, Legs, Feet, Face etc).
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Change the ‘Forced LOD’ on the LODSync to 0 or higher if you want lower quality, 0 is highest.
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Make sure the Components to Sync match the text you have for your MetaHuman assets like Torso, Face, Feet, Hair, Beard etc otherwise it won’t know what to set the LOD level on. (make sure the hair component names on the face match up to what the Components to Sync says or vis versa, they must match.
Video demonstration
BONUS:
If hair is bouncing in the face of your player during play but you don’t want to hide the head/hair so you can still see accurate shadows of the head and hair being cast, disable simulation on the hair NOT on the asset itself if you want to be able to reenable hair bouncing/physics during scenes again via BP
To enable/disable via BP do this…