Playing Devil's advocate here, so I might need some further information..
Which favourite, prepost, tab, bookie, betfair?
What prices, tab, bookie, top fluc, betfair?
I don't say it can't be done, because you did it, but I do query whether the next 1,000 might be Total profit = 6K loss.
However, you juggle the staking plan, eventually the average odds will catch up, be it 1,000 or 10,000 bets from now.
You could however take Banker's insurance a la Blackjack, and stop as soon as cumulative loss is greater than 50% of cumulative profit.
I.E. keep the ball rolling until things turn ugly and still walk away with the chocolates. You might get a very nice run for a while.
I have played blackjack this way and took home 15,000 from a starting bank of 200 at Crown (three orange tigers was nice), but then they barred me, they thought I was card counting
This was 8 years ago, and I haven't been back since.