I held the shroud up to a bright light and could the former was being bent and pushed in at an angle.
The corrugated cardboard was a good "soft" bulkhead but was distorting under the pressure against the shroud wall. I wanted it to be straight. It'll need to be stiffened up slightly.
I cut some scrap cereal box cardboard. the printed side was roughed up with some 220 grit sandpaper so the glue would hold better.
After more test fittings this is where the former ended up down the engine tube.
Fillets were applied to both sides.
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