Hi dingo, I tried to email you the excel stuff but it got bounced back.
Sorry about the ambiguous double-up suggestion. What I was suggesting is this:
bet one unit each race regardless, if the previous runner came in bet the total won (stake+dividend) on this race as well. This plan relies on clusters of winners. I'll send you a simulation spreadsheet if you can work out how to get my emails through!
There was many place staking plans discussed about six months back if you want to search for them.
Cheers, Dirk