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Whenever I buy taps or drills, I always buy Made in the USA. You can expect to pay at least double but the quality is there. Good taps last for years, cheap Chinese taps may last 2 or 3 times. Also try to make sure you use the correct size tap drill. A 1/32 either way on the size will make them tight or loose. Also if your drill has been sharpened the person could have ground one side more than the other,that will also make it drill bigger. You could check that by drilling a test hole in a separate piece of material then check the inner diameter with some calipers. That is where I would check first but I am no machinist either.
