Ok so the dirt cheap twisty knob window units are all over the place because they don't work too well. Nearly all of them have the lowest efficiency ratings ever. For your goals they don't have enough surface area to dehumidify well either.
My advice would be to find a 9k to 12k window unit with a digital control and energy saver / energy star functionality built in. These units are usually physically larger than the equivalent capacity cheap units and have bigger heat exchangers in the box. The control board has different programs that would suit your needs better.
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