This is not correct. They hve always open gradully. The diff in pressure makes them open as a function of it. It's a suction effect. The more, the wider ( humm.... stay focused.. )
The prob with the wider LE was IMOHO with the prop wash that in certain situation (yaw) prevented one slat to fully open. Having yaw angle is fairly comune during a DF unless you stay focused on your slip angle.
~S!
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