I just tried it again cold right from the gym, zero warm ups. I did not edit the video, shot 10 tries of each version, you can see my misses and miscues!

I also tried to shoot fast so the video would not be too long.
Trial 1: 5/10 middle inside 3 rails
Trial 2: 7/10 low outside z shot
Trial 3: 5/10 middle inside 3 rails
Trial 4: 1 rail bank. Impossible even for Brumback I'd bet my house.
Trial 5: 3/3 4 rail safety executed perfectly each time. But IMO, its a poor shot for THIS situation because, it leaves the cheese if playing 9 ball, and if playing 8 ball like the original poster was, it makes no sense from a game strategy standpoint because it was the OP's final ball before the 8, and his opponent had many balls on the table.
Trial 6: 3/10 high inside.
I'm a crappy player, my straight pool high run is 38 balls. I'm certain a slightly better player than me would have a way higher percentage on the inside 3 railer. I actually surprised myself I hit the outside z shot better than the inside 3 railer. Yesterday when I shot this I hit the inside 3 railer much better (regarding pocketing the ball.).
Video if you want to see
https://www.youtube.com/watch?v=DwX8gSI0CSw&feature=youtu.be