chief, there are a lot of place bettors in this forum, me being one of them, but one theory I did like recently (Privateer??) was to bet 1 unit win/3 or 4 units place. It's more for a place bettor delving into win betting rather than the other way around, but you need a fairly solid strike rate to be a place bettor in the long term so don't dismiss win betting straight away.

Good luck.