Misfire at cruise, popping/afterfire at 3000RPM

That's pretty much exactly what my process was. I started with a piston stop to ensure TDC, because I wasn't confident in the balancer's accuracy. Then once I was at #1 TDC compression, I divided the balancer into quarters using a paint pen.

When I got to #4 and found the leak, I backed up the crank to see any difference, and then moved forward. The best I could see was 85% leakage between cylinders 8 and 4, and between 4 and 3.

I had the valve cover off, but for some reason it wasn't as obvious as it was with my 318. All rockers looked pretty equal.