2007 Hyundai Accent SE 1.6L Misfire

The fuel trims have been fine, I've smoke tested twice. I have realized that if this thing is going to miss at all it's only after a hot soak. I had my lab scope on low amps on injector circuit and notice an extra "bump" in pattern before every #3 injector event. I had noticed this before swapping injectors before. When disconnecting that injector it's a clean space in pattern. This leads me to conclude with very little certainty that I have an ECU problem. Which leads me to next question- can I put a used ECU in this thing without any reflashing? I'm willing to gamble to get this out of my life if I'm not going to create further headaches.

Code: p0303-

swapped plug - same
swapped coil - same
swapped injector - same
compression - good

You know, i just kind of stumbled across an example of this in my Scanner Danner book at work the other day.
Here's a capture from the Chapter18 part 4 premium video, and a link to that video:

www.scannerdanner.com/scannerdanner-prem...-testing-part-4.html

Is there any way you can upload an image of the waveform you're getting on the #3 injector?

As far as being able to plug in a used ECM and drive away, I'm not sure. I would think 2007 model year would probably be ok?

will try and upload waveform