I don't know anything about frozen, because we used fresh, however, one reason artificial insemination is more likely to result in a boy is because the XY sperm is faster but dies more quickly, XX sperm swims more slowly but lasts longer. So if you are testing your ovulation and insem. on the day you ovulate, there is a higher chance of the XY sperm making it to your egg and resulting in a boy. It was true for us-- my wife got prego with a boy when we did the inseminating on the day she ovulated, for me we inseminated 5 days before I ovulated, so by the time I ovulated all the XY sperm was dead, and we got a girl.
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