Its only fair to point out that problems with automatic leading edge slots that opened suddenly, were not unique to the Me109 at this time . The Westland Whirlwind also had the same issue but the squadrons decided in most (maybe all) cases to lock them so they wouldn't come out and live with the extra landing speed.
The Luftwaffe with the greater emphasis on these devices changed the design on the Me109F so they opened gradually. Kurfurst knows more than me about this but I think thats the basic situation.
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