In the end there is no strategy.
Many times you can play a perfect match by betting carefully & strategically, and be well ahead all the way down to the very last hand, and then watch your opponent simply lay everything thing he has left, or double down, knowing he has nothing to lose, and win with that final deciding hand with some crap or you busting.
Nothing like poker and until they change the rules a bit on blackjack tournaments it's never going to be attractive to players in my opinion...