Haha, Scott, I can't believe you actually tried to replicate it! Not only have I only ever tried that maneuver once, I've only ever had one opportunity to even need to use it. I remember doing in one of my last serious mame games I ever did, and I think during the time I was quite into dodging fireballs by standing as much over an edge as I could and simply jumping when they approached (I often trapped myself on the side conveyor platforms, you see...
). I'm not sure what percentage of the time the ledge-avoidance-technique (LAT, another acronym???) works, but I think it may be better than simply trying to jump the fireball. We'll have to see what Dean thinks, since he seems to have a deeper knowledge than I do about the distances that fireballs need to travel before they turn around. As far as that specific example on the rivets, you may be right in that it takes 'PPP'.
Chris, kind off topic, but talking about the Rivet screen: I think I've realized a 'how to proceed with things if the star pattern fails' situation that I've seen a lot of people do incorrectly. This might start a debate, but, in the rare case that a fireball blocks you off from getting the very bottom left rivet, I think it is actually best to just skip it and continue on and get the top left two rivets. I've seen several people try to dance around and get delayed trying to get this rivet, only to then get delayed further trying to get the top two rivets or even the hammer on the way back down. The main reason I think it is generally best to just continue on, is because the bottom left rivet is significantly easier to just grab later than, say, if you were to skip any of the other 3 left-rivets: simply draw all the fireballs up to the top (later, when they are trapped on the left), then outrun them to the bottom. What do people think?