I feel like I shouldn't even be posting in here because I am so uneducated on this topic compared to the other posters. But I'm going to toss in my two cents because you're one of my favourite paleohackers. I find it so strange that a guy as ripped as you is said to have "probable metabolic syndrome".
Like others have said, I feel this could be thyroid related. Perhaps you are deficient in a micronutrient (iodine, selenium, magnesium, zinc?) and need to go on a higher dose for a bit to make up for the deficiency. On that note, what's your liver/offal intake like? Maybe frequent intake of liver could address a micronutrient deficiency (as well as provide vitamin A as Quilt has suggested). Also, how's your sleep and stress?
after 2 months of VLC and high fat zero starch, with plenty of butter, some raw milk, coconut oil, plenty of whey protein, 3x wk heavy lifting, I tested for 85 fasting trigs back in Oct 2010. So it may be the combination of starch and fat that's getting me
Perhaps you just don't have the genes to do the fat+starch gig. I think the key point is that your trigs were ~30% of what they are now after doing 2 months of VLC. You could try going back to low-carb for a while, while still doing the HDL boosting things you've been doing lately (tons of coconut, eggs, avocado, maybe macadamia nuts and dark chocolate, etc.). ~50-70g of tubers in the evening and ensuring proper micronutrient intake (liver, shellfish, iodine, selenium) should keep your thyroid in business. But again, if you do have a thyroid problem, I would probably you should forget about everything I just said in this paragraph and do whatever it takes to get that thyroid pumping. Perhaps a full thyroid panel is in order.
Please take my two cents with a grain of salt. Again, my knowledge here is limited. Keep us posted.
ETA: I assume the reason I got downvoted here is because I may have come across as carbphobic. To add to that last paragraph re: starch+fat being an issue: The other option is to try the high starch/low fat route.