I'm pretty sure that the ALDA is dual-purpose; acts as an altitude compensation device to prevent the black-clouds at altitude that you could otherwise produce.

At 11,000' you only have 2/3 of the air at sea-level, and can only burn 2/3 of the fuel. Once boost builds, you're fine, but the lag will be greater at altitude. Eliminating the engine's ability to limit the off-boost fuel will almost certainly result in overfueling at launch.

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Gone to the dark side

- Jeff