I've been trying my system for a few months (just backing and laying dogs (purple) and horses (blue) at better odds than bookies before the off) with mini stakes.
Here's the bankrool graph normalized for 1$ bets on a 100$ bankroll
That's about 1200 dog bets and 600 horse bets over 90 days.
I think the dog system (purple) is working. Though I think the horse (blue) system might show promise as well
Do the equity graphs of your winning systems look like that?