I think Apple gave me 2 lemons. Am I SOL?

I work for a video production company and in 2016 we purchased a MacPro to help our editing team with higher resolution and frequent output. It was a late 2013 model: 6 core, 16GB RAM, AMD FirePro D700 graphics.

Our company exclusively works in Adobe Premiere Pro for editing and right away we noticed horizontal glitches or artifacts appearing in our exported files. I did some basic research and saw that this was a common issue and took the computer to Apple. Over the course of a few weeks they did several tests: added more RAM to see if that was the issue, replaced the graphics card, updated the OS, reinstalled Premiere, and none of it helped. They tell me I should contact Apple Support for further troubleshooting.

I bring the computer home, contact apple support. They tell me to run some data captures and the send them some screenshots of my settings in Premiere so they can identify the problem. After a few weeks of this, Apple ultimately came to the conclusion that the machine was defective and agreed to replace it.

A few weeks later our new computer arrived with the same specs. We installed Premiere and began editing. When the time came for our first export, the exact same issue occurred—random horizontal glitches in the video file. At this point we were so behind in our post production schedule we had to set aside the computer and rely on our MacBook Pros and older iMacs to get us through the year.

Earlier this year in 2017, I took the replacement Mac Pro back to the Apple store. I tried my best to explain to them that it was a replacement computer that was having the exact same issues as the first and that I thought I had received another defective machine. They told me that Apple now had a repair program in place for a specific range of serial numbers that were identified as defective in the late 2013 models. They looked up the serial number for our replacement computer—it did not qualify. They agreed to hang onto it a run some tests. A few days later I get a call and they say there's nothing they can do in-store (which I anticipated based on my first go-round), the computer passes all their tests. They encourage me to contact apple support. I bring it home, run a complete reinstallation of OSX on the computer, reinstall Premiere, try an export—glitches keep appearing.

So I call Apple support, do my best to explain this long process of back and forth. Eventually they have me run more data captures, more OS updates, more Premiere updates, and more data captures. My advisor says he's going to hand all the info over to the engineers and that they will get back to me. A few days ago I get a call from my adivsor. This is now nearly 2 years since the computer was purchased. He tells me that the engineers are submitting a bug report and if they figure out a software fix for the issue they will let me know. So the 2nd time around, with the identical problem, Apple doesn't think it's a defective computer, just a software issue that hopefully get's fixed.

So after all this back and forth, not to mention the $5k we put down for this computer, is my 2nd lemon MacPro doomed to be a glorified paper weight? As is, there's no way I can rely on it to output clean video files. If an identical graphics error is occurring in 2 computers, across dozens of softwares updates from both Apple and Adobe, isn't it fair to assume that more late 2013 Mac Pros are defective than what Apple agreed to recall? How do I get a computer that works? Or am I just SOL?