I totally agree with the above recommendations to use a 24 tooth, thin blade, but would also recommend using a splitter, or riving knife, to prevent the wood from squeezing the rear of the blade.
If you are cutting unjointed, possibly "wet" 2x4s I would not suggest cutting half depth & then flipping the boadr as the uneven surface could/would cause additional binding. Keep in mind that when a blade is totally "buried" in the wood, clearing the chips is problematic. Typically the gullet of the blade should be slightly above the top of the wood being cut to help clear the chips.
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