I've just been digging around through some of my old stuff and I've come across some old systems that I've collected over the years. Can anyone tell me how this one has gone in the last few years. I think it did pretty well back when I first came across it about 10 years ago I think.

(1) 1200-1850m
(2) 8-14 starters
(3) Highest average prizemoney earner
(4) Barrier 1-7
(5) Last start within 21 days
(6) Finished in first 4 last 2 starts
(7) Up or down no more than 2 kgs
(8) Up or down no more than 200m
(9) At least 10% wins

I'd also like to check how it would have gone with rule 4 changed to Barriers 1-3 or with rule 4 deleted altogether. Not sure I'm keen on using Barriers 1-7. Why should barrier 7 do so much better than barrier 8???