Answer
If the game is structured normally in that you can keep track of small and big cards then you can swing the advantage to your favor by betting more when there are mostly big cards and aces left. Any fine book on card counting like "Professional Blackjack" by Stanford Wong would be a good book to start with.
If the game is such that tracking cards isn't possible (like the game is dealt from a continuous shuffle machine) then you might be able to get an edge if you are a big enough player via loss rebates or other perks. In that case your safest way to play is to just flat bet.
Since your edge is always the average house advantage x total action moving your bets around in lieu of other information would be pretty much useless and would only serve to increase your variance.