Are we positive the CHT is really 400....?? Just a thought here but have you tried swapping the CHT probe from the suspect cylinder to another cylinder and vice versa? Are these the same probes in the exact same locations from the previous engines? It would be an interesting experiment nonetheless. If swapping probes leads to the same temps, then you know the 400 is valid.
I know another favorite of Mike Busch is to check the flow of the injector for that cylinder. Maybe that single injector is all jacked up. Just a thought....
Good Luck my friend!
I feel your pain.
Ed
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