The limit weight for nearly all races is 53kgs. Your system requires you to place bets on horses that carry UNDER 53kgs. Therefore your selections in nearly all races are carrying under the limit weight which of course means they must be ridden by apprentices claiming an allowance. If it were a high quality handicap then perhaps the limit would be less than 53 and a senior lightweight could ride but in your week in week out races, 52.5 or less means claiming apprentice.
I'm not having a go, just asking if that's how your idea works.