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I agree that US 4 is too small for worsted weight except under special circumstances. I'm a loose knitter so I usually use a 6-7, but the suggested needle size is usually 8-9.
I started with bamboo, but now knit with nickel plated/metal. Unless you're having issues with the stitches slipping you may not need to try bamboo, but do get bigger needles either way.
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