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Level 1581 is a Rancid level that I just tried. It also has snowballs and firecrackers. I can understand wanting to use the tractors, as it helps clearing the snowballs once they start to fill the screen. I used four tractors, but didn't have any issues. I actually used all of the four different boosters, but none of them caused any problems.
Having said all of that, the fire crackers, tractors and snowballs can all cause issues. They can cause the board to shuffle due to long term bugs and they can cause the level to fail. So in regards to this specific level, I am currently unable to provide any more assistance. All I can suggest is that you take some screenshots or maybe a video of the game play.