Ok how about this FTF, punting is a game of opposites, what you are suggesting is what most do and what do most do? LOSE.
Most try to eliminate losers buy getting very selective and having larger bets, great until a losing run comes and then for the majority your judgement changes and slightly marginal bets that you would take when riding a high are left out, they invariably win and you cement in loses, further buggering your mental game.Punting is largely mental toughness, it’s what undoes most and why they don’t win.
Think about this approach: turnover is key, how many times can you turnover the same money on a Saturday, have smaller bets but plenty of them. I have given you 2 non form approaches above, here’s another that works and applies the opposite thinking to what the BP would suggest.
Look up the racing multi section of the TAB there they have the opening fixed price and they show the market changes, look for single figure openers (Below $8) that have drifted into double figures, pure gold winning Blue Print there.