Troubleshooting artifacts with dynamesh and projection

Hey folks!
I brought the cushioned part of a chair into Zbrush from Max - made a little messily as I had dynamesh in mind. However, when I go to run the operation I get a weird lump artifact over the seat pattern detail. Before and after Dynamesh

I tried projecting this down onto the original mesh and had slightly better (but still totally unusable) results 

Disassembly of the original chair in Max

I initially thought it might be being caused by the holes in the two main cushion pieces, and reproduced the dynamesh and the projection workflow with a version where they'd been properly capped, but got the same results. 

This is almost certainly user error in how I put the original piece together, but is anyone able to spot a workaround?

Cheers for looking, and all the best

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