Check engine light on, all cylinders misfiring?

I had that thought in mind and checked it thoroughly with carb spray Sunday and couldn't get a solid indication that was what it was, but I'll check again, hopefully today, since the truck is usually on route during the weeks. Thanks

This is a follow up from December 12th question for the same truck; 2015 F650 / VIN #3FRNF6HP8FV625354 / 6.8L V10 / 173,912 miles. In that question I forgot to mention the tires were replaced a year ago and the tire shop put on 11R22.5 tires instead of the OEM 24775R22.5 tires. I put a smoke machine on the intake manifold and there were no leaks from anything, so I ruled out a vacuum leak. I've checked all electrical connections and plugs then replaced the cam position sensor on the passenger side head out of desperation then drove the truck; the code stayed cleared during the test-drive but it still was showing anywhere from 2/20/30 random misfires on most cylinders and the only way to increase road speed was to push down on the accelerator and drop it into lower gear then back off the pedal to bring it into overdrive. The tire size swap has thrown the speedometer reading off; checking the speedometer against a speed app (satellite) the speedometer will show 60 mph while the app is reading 78 MPH. Have a lot of labor time in this unit over the past year and the dealer is no help, only says bring the truck in and then it'll sit for months on end. Any suggestions / help greatly appreciated.

Unfortunately, I don't have access to a scope, which would definitely help. Out of desperation I swapped ECMs with its' sister truck (same year and engine) then test-drove but it didn't make a difference in performance, I've pretty much run out of options except to start replacing sensors and don't see the sense in that.

The fuel pressure at idle was 55-60 PSI and stayed pretty much the same on a road test but I never did a fuel volume test, do you have the specs for that?