I can see making the 8 if the cue ball is nearly in line with the two balls, but I really can't see it happening with the angle shown which looks to be 30 degrees or more between the approach of the cue ball and the line of the two balls. I'll try it, but I'm very dubious.... You need to sink the 8, and you can do it by shooting the wired 8-3 combo into the pocket with very high soft follow, and then letting the forward roll of the cue ball double kiss the 8 into the pocket. The hard part is where to aim. You can't aim as if cutting the 8 directly into the hole or the cue ball just passes the 8 without double kissing. You can't hit it right in the fact either, or you double kiss the 8 but send it in the wrong direction. The best I've been able to figure out is you want to cut the 8 slightly in the direction of the pocket, but the hit is very close to full. And you can't hit hard or else the 8 caroms too quickly in the wrong direction away from the hole, and simply knocks the cue ball out of the way.
Do you use a heavy cue ball?