Okey-dokey...I've watched all the PAL replays posted so far and I can't use the green flag image for any of them. I'll list them in the order of "cleanliness":
holl01 - 25'23.149
Lap 2, Corner after T1: This is the only corner in the race with a question mark over it, here is a picture:
This corner has irked me for some time because it is very unclear where the road ends and the grass begins. I would be hesitant to classify this as a "dirty race".
ballstothewall - 25'50.679
Lap 1, Corner after T1: There is a minor touch of the Gillet Vertigo but it is fairly minor, if it were a real race I doubt it would even be reviewed.
Lap 8, Second last corner: A slight off that I have pictured below:
As you mentioned balls it is definitely 3 wheels off but it is very very close to being clean, however contrary to your justification, I would call it a help and not a hinderance, it provides a better line for the next corner but again I would be hesitant to classify this as a "dirty race".
zdenko - 26'08.925
Lap 1, Down the first straight: There is a decent touch of the Lister Storm, it is a decent hit and personally I would have just restarted but that's just me.
Lap 8, Corner before T5: Here you have a minor collision with a Nissan of some kind while trying to dive inside them, I would consider this a slightly reckless attempt at an overtake. As for how to classify the race....I dunno???
shockwaveracing - 25'41.689
Lap 1, two corners before T1: A major collision while trying to overtake the Gillet Vertigo. This one confuses me??? I wouldn't have even considered continuing the race because it was such a blatant mistake? holl01 makes the same overtake in his race nice and cleanly so I don't see the need to continue with your race? Having said that, the rest of the race is squeaky clean but that collision is fairly serious.
Anyway I know I've come across as a real bastard over the last few weeks, what with all my bad news when checking replays but I'm just stating what I observe 👍