First of all, don't give too much value to one single test. In my experience testing it for the last 10 years (14 times) often it fluctuated widely (between 6.4-14.1), and averaged at 10. Also has to be centrifugated right after the blood draw (my GP didn't know), otherwise it increases in the tube every hour by about 10%. Has to be fasted for 12 hrs too. There aren't immediate symptoms from not optimal homocysteine, just increases with many conditions and increase with all-cause mortality.
By the way, I do take about 3 g/d of taurine, have sky high B6, B9 and B12 serum levels. Which all didn't permanently made a dent in my homocysteine levels yet. However, I still have upward space for my intakes, since I till now only took 1.6mg of B12, 2mg of B9 and 160 mg of B6. And saw many here at PhoenixRising take multiples of that.