when you roll into the pedal (when it won't actually increase rpm)....are you seeing a corresponding rise in desired ICP, increase in IPR%, increase in ICP_actual pressure...as well as increase in Accelerator position(volts or %)?
either way...none of those items would cause a miss...a miss is either an injector or an engine problem...there isn't a sensor, valve or doohickey on these engines that would cause one inj to fire differently than the rest.
This sounds awfully similar to the 100 phone calls I get every day...about the FICM voltage being low...
but...if FICM voltage is fine..then it's an injector problem, )unless the engine has a mechanical issue)< low compression, etc.
extremely high ICP can make a truck sound choppy, very 'crisp'..but not rough nor a miss...
and assuming you don't have a constant CEL/SES light on...means that the electrical connections b/w the FICM and the injs are fine.
your idle pressure & IPR% look spot on...btw..
Assuming FICM voltage is good...check fuel pressure...but if there isn't a FP (or fuel quality) issue..then it's inj/engine related...