Mat,
About your strategy. Can you clarify where is the range of winnings/loses comes from? It seems to mee like your strategy only minimizes the possible losses but there can't be any guarantee that you won't bust your deposit (even with %1 possibilty, it's much higher).
Is there any mathematical model for calculating such ranges ?
As for me, I've lost $90 out of $100 deposited right after 2 hours of playing blackjack. Than I got careless and made higher bets ($2-$5) . Finally im in a surplus of $200 . Just luck!