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Michael
I would guess that you have read our posts on GS4 modifications.  In the post your will see the arch in the firebox.  This one is a simple design held in place by the wick containers.  One could also do a baffle/arch as did Gordon (if I get a chance will post photo).
The reducing ring on the center flue in the smoke box was documented by Dave Hottman long time ago.  Recently we repack a burner set of wick using Gordon's layout of wick material- outstanding fire!  Might be the fuel flow, maybe need an extension adjustment on the sump.

Dave Hottman reference in archives(with contributions from Brooks, John and Andrew):
http://archive.mylargescale.com/forum/topic.asp?TOPIC_ID=35223&SearchTerms=GS4,restrict

Try original wick design with arch and restrictor in center flue.
 

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Jim
Assumptions...given Gordon kit and the numerous ones we hae done; exhaust nozzle was spot on, so I never questioned that but it would effect the performance.  One can solder the hole and re-drill, 2mm
 
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