If you wish to test some of your ideas on a 2 year data base , free.

You may like to try (Google) OnlineSystemBuilder.

Some suggestions you may like to try...

.Target Barrier No.3 only.
Then place your filters over these runners to find qualifier.
This will save you a lot of time & its very accurate, most days of the week.
You will notice how many of these don't win & also the number that get scratched- strange.

.Price range 5.00 - 11.00

.Bet .60 per $100.00 Bank.
The Liability will be lower on low priced runners & higher on high priced runners, where their chance of winning is usually less.
This will keep your confidence up , if we strike a bad run.

.Target one selection per venue .
For stronger, more consistent SR.
e.g. 10 venues = 10 qualifying selections for the day.
The reason for just one per venue is to try & avoid those days where a certain pattern repeats itself all day & that pattern may just be you filtering process winning instead of losing.

If all 10 are successful , you have just increased your bank by 6% which is considered a brilliant result , because its not always easy to do, all the time, but we have a mathematical edge if we restrict ourselves to just 1 qualifier per venue.
You are now a genius on the punt.

P.S.
There are very few punters who have the discipline to control themselves to 1 selection a venue, that's ,why most lose in the end.

This one rule on its own, will make most lay systems percentage SR, a lot stronger.

There will be others who will argue differently ,rightly or wrongly & that's fine.
In lay betting , the more bets that are made at that venue , the greater the chance of being bit.

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Cheers.