Rough running brand new 912uls

Thanks for all the advice.  Roger, I thought for sure the enrichment carbs were the problem but they were not.  However, I have found the idle problem but somehow caused another.  The idle problem was crimped supply and return lines.  On the Searey, the fuel lines run from the tank/aux pump up around the turtle deck behind the passenger, up through the pylon, down the boom tube tube to the fuel pump.  The return line runs basically the same route.  Where the lines passed through the baggage tray, behind the passenger, I had done too good a job in fitting around the wiring and fuel lines and they were pinched.  The engine idles great now so I figure the crimped fuel return line was causing an overpressure and flooding the carbs.  I cut out more clearance for these lines and it idles fine.  

However, now it won't rev past 3500!!  I'm waiting for the engine to cool to check the main jets.  Throttles both open to full stop.  Floats are 10.5mm.  And I'll search on here for other ideas.  It must be something I did since it was revving fine yesterday.  

The problem was both the fuel supply line and return line were pinched where the line passed through the baggage shelf behind the passenger. I cut out the area for more clearance and it idles smoothly. 
HOWEVER, now the engine won't rev over 3500!!. Floats are at 10.5mm, main jets clean, carb slides not sticking and are working when engine running.  Checking fuel flow and pressure today.  About out of options.  

Sooty plugs are symptom of running too rich. Check #1 & #3 (right side) carb choke circuit as suggested above.