Ive been trying to figure out this system since i read the post and get - to a point.
One flaw i cant seem to think out is what happens if you lose 4 in a row then win then lose another 4 in a row going 1 -8. That middle number is large enough to begin with when your that far in.

Maybe what would be helpful if a simple betting chart was set for just one round of betting in the worst case scenerio and the amount you need in your bankroll to cover the entire series.