Answer

1. I don’t think there are many contradictions. The example you gave is not a contradiction. A contradiction is when Jewish law forbids something and Kabbalah requires it, or vice versa. In the case of the beard, Kabbalah is simply more stringent than the law. The idea of being stringent and forbidding what is technically permitted also exists within Jewish law itself. True, here and there there are contradictions (such as the orientation of the bed), and about this the Magen Avraham wrote in the laws of tefillin that when there is a contradiction between Jewish law and Kabbalah, one should follow the law. But of course he wrote this as a halakhic decisor. As far as I know, most kabbalists do the opposite (see the Talmudic Encyclopedia, entry “Halakhah”).
2. And even if these are two Torahs, why is that "Heaven forbid"? There can be mistakes in Kabbalah, since its sources are not clear. I understand that you assume it was given at Sinai, and I very much doubt that. My impression (which is not well founded) is that these are mystical intuitions of people with mystical abilities (those among them who are not charlatans). Those intuitions may certainly have value, but that does not mean they were given at Sinai, or even that they are based on principles that were given at Sinai (like Jewish law).