To be able to win a DT or do good in one you need to play FAST !!
Find a deck that suits you, weather its upper / Ambre or montan Hugo it depends on your playing style and once you find the deck you practise with it, trust me you'll get better and better each DT
This is my Deck just in case you need a Start New TD victory
so far i've only won 1 DT with it
I hope it helps you out