Carb settings SJ

Location
N.Ireland
Every few hours my 05 superjet starts to misfire and bog down at mid too full throttle.

Im running a riva wetpipe, riva head, Riva flame arresters, Boysen rad valves and stock 38 carbs.

As soon as i change the plugs for new ones it goes great again.

What jetting would you suggest for the stock carbs.
 
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