First of all, welcome to Basenotes! I would recommend that you take a look at the related thread on this page entitled "So I'm going to buy a vetiver...which one should I buy?". In that thread there is a link to a competitive review of vetiver scents that I undertook some time ago. I mention this because there were several of the 30+ vetiver scents that I reviewed that had that burnt sugar/syrup note that you're apparently after. To cut straight to the chase, I noted this characteristic note in both Molinard Vetiver EDC and Demeter Vetiver. You can read my original thread mentioning this to see what other comments I may have had on them, and where I "see" them stand in the pantheon of vetiver scents.
Having said this, I am going to be purchasing Fresco di Vetiver EDT from i Profumi di Firenze. It is an outstanding vetiver cologne, fresh and light while also featuring excellent longevity, but without the burnt sugar note you've requested. Good luck!