Could someone run these throough a database for me. Have created the first one from a online system bulder tool, but seems inaccurate

First sytem
Metro only
Barrier 1-6
Won at distance
Won at venue
last start place 1,2,3
Must be under $6

2nd system
TAB number-1,2,3
Barrier-1-6
Price- over $20

3rd system
TAB number- 1,2,3
Barrier- 7+
Price- over $20

Doing it now for you

Selections 7641
Wins 2022
S/R 26.46%
LOT -15.53%

Selections 14071
Wins 279
S/R 1.98%
LOT -37.72%

Selections 18818
Wins 442
S/R 2.35%
LOT -24.92%

Cheers Shaun,
Confirmed my thoughts about the first one, on the online system builder I tried it showed a 10-15% strike rate dependent on venue, and a LOT of around 65%.

Those other two was looking at laying the longer prices, but seeing as prices on betfair are usually much higher than, I dont know how it would fair.

Any suggestion on basic filters to try and make any of them lose eve more, but still keeping it high turnover?

Try & keep in mind, that each time a new filter is introduced, it reduces the volumn on turnover quite a lot.

When inventing Lay methods from losing Backing systems , its a strong idea to target failed systems that have a min -20% LOT as a starting point & build from there.

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Cheers.