I believe your "aileron wipers" are what today would be called gap seals. They would prevent or restrict airflow through the gap between aileron and wing structure, preventing an upward-turned aileron from acting as a trailing edge slat, especially at high angles of attack. If you're turning at 320+ knots indicated, you're almost certainly pulling significant G and angle of attack, and the lift is distributed across your wingspan. If the air under one wingtip suddenly finds a "shortcut" through the aileron gap to the top surface low pressure area, what's going to happen to your spanwise lift distribution? Right, one wing is going to suddenly have A LOT more lift than the other and you're going to bash your helmet against the side of the canopy. And that Zero turning in behind you will find you dead center in his gunsight.
Cheers,
Wes