shoto, Sorry but I can not divulge just how to achieve 80% S/R. But I can tell you that I am getting better than that at an average divi of just under $1.50.

But, just let me say that you could start with RATINGS based selections, these could be your own or "professional" ratings.

What I am saying is that you have to be amongst the winners to start with!!!
Lets say that you subscribe to a "well known ratings service" with a Win S/R of better than 30%, and a place S/R of better than 65%, so you know from the outset that the worst you can do is 65%.

OK so now you apply your favourite filters, and through trial and error, you gradually achieve your goal (ie PROFIT)

eg.
50% place S/R
raced within 21 days
win in exposed form (last 4 runs)
no bet 2nd up IF won 1st up.

Raced within 100m of todays distance (last 3 runs) OR be a distance winner

NO BET IF RIDDEN BY A 3kg CLAIMER

NO Bet jumps or races for fillies and mares only or apprentices only.

Must be riding within 3.5 kg's of set weight last run + or -

Must have been within 3.5 lenghts of winner (last run)

the rest is up to you!!