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I don’t think you can go too wrong with any bet sizing you choose on this given board texture. With 4 to a straight, we can likely assume that anyone would be raising if they have a 7 here. It’s also unlikely that either opponent has a 2 given how it was played. If there were more combos of the ‘bottom end of the straight’, I’d advocate for a large bet to target those hands to pay you off. However, with this exact board texture, I feel like a just under half pot size would be best, hoping that over-pairs/sets/two pairs call your bet, and any 7 will raise. Especially since you said the button tends to overfold to large sizings.