SB or Others, i'm interested in your thoughts on something.

Today I was fiddling with the data i've collected thus far looking for a way to profitably lay my lowest raters. After some mucking around and looking at various stats etc I found something that made sense and looked profitable.

Now, so far i've used an overlay range method to make my top raters profitable, but i thought to myself hangon why not just only play my top raters when my bottom raters throw up a lay opportunity.

I won't post the stats etc as i'm still looking into it, but does anyone else take this approach or has tried this approach of only backing horses when a profitable lay system you have, has a play in a race.

The reason I ask is doesn't it basically turn say a 10 horse field into a 9 or 8 horse field for your backing selections? Which you can possibly narrow down further and basically gives you greater opportunity for winners?

I could be way off track with this but it makes logical sense to me providing you have a very good lay system to base it off to begin with.

Thoughts?