2011 Toyota Camry; Cylinder 3 misfire at 60+mph; P303 & P420

Morning everyone!

I’ve been dealing with a 2011 Toyota Camry with the 2.5L 4 cylinder. The car has an oil consumption problem about 1 quart ever 500-1000 miles. The car starts and idles perfectly fine. 
The car began misfiring severely at 60+ mph with flashing check engine and traction control lights. If you let off the gas once the light stops flashing it behaves normally until you get to that 60 MPH mark again. The DTCs returned were P303 and P420. Spark plugs are fairly new, I’ve swapped coil packs to rule them out and just finished replacing injectors. Problem remains on cylinder 3 with new injectors however, now it is misfiring around 75MPH. 

Compression test checked out good. All cylinders were at 210 PSI
Completed a leak down test on cylinder 3 and got virtually 0 leak at 100psi. Left cylinder pressurized for about 20 min with no change. 
No back pressure on catalytic converters. 
dropped exhaust to verify that cats weren’t clogged and noticed that they were actually gutted. Which would explain the P420 code. 
Stuck my borescope down into cylinder 3 and captured some images. 
performed smoke tests and have found 0 leaks. 
I believe this model has flaps on the intake manifold. Could the flap on cylinder 3 be faulty and cause this misfiring under higher load?

Is it valid to assume the oil consumption is occurring at higher engine loads and getting past the rings, specifically on that one cylinder? It’s there anything else I could possible check to diagnose this misfire? Any PIDs I should monitor using my scanner or anything I should collect data on with a lab scope?


Thanks!