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Tessellation limit?

Is there a cap placed on the tessellation input? Values above 8 don’t seem to tessellate the meshes any further.

Yes indeed, the tessellation factor is limited to 8 for performance reasons.
https://answers.unrealengine.com/questions/8982/tessellation-limit.html

You can however increase this limit by editing the FlatTessellation.usf and PNTriangles.usf shader files,

[FONT=Courier New]float4 MaxTessFactor = 8.0f; (line 68/86)

That worked. Thanks!