Looks like you need a couple more hits.
I'd like to see if "a couple" is a predeterminer and "more" a central determiner in the noun phrase "a couple more hits".
I'm inclined to say that "a couple more" is a determinative phrase, where "a couple" is a noun phrase functioning as modifier of the determinative "more" (the head of the DP).
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I'm inclined to say that "a couple more" is a determinative phrase, where "a couple" is a noun phrase functioning as modifier of the determinative "more" (the head of the DP).