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Hopefully others can jump in with guidance on your Thyroid numbers, however as someone with quite a bit of low-carb experience and a long time observing different eating patterns, I would caution against a zero-carb approach. I suggest reviewing the posts called "Dangers of Zero-carb diets" on the Perfect Health Diet blog.  There is a lot of controversy about the topic and there is a widely repeated meme that the body can produce all the sugar it needs, however if ketosis benefits you and you are quite active, you may be able to stay in ketosis at much lower overall risk if you keep net carbs at 50-70 grams a day and add some MCT oils. Many people report thyoid issues at ultra-low carb levels which resolve at slightly higher but still ketotic (or cyclically ketotic) levels of carb intake.  I believe the KetoGains site may have some good info on this as well and the issue you raise seem to be much more of a problem with highly active people. Also note that for many people, a vegetable-only carb source is a zero-carb diet since many people do not the absorb vegetables as carbs.