One thing I have noticed is the rules we are using are BEFORE scratchings.

Hence where I have suggested using fields of 8-14 these are before scratchings and could include races with 5,6 or 7 starters (after scratchings) and similarly for barriers 3-8 if a horse drawn in barrier 2 is scratched the horse that would have moved from barrier 3 to 2 still qualifies but a horse moving from barrier 9 to 8 does not.

I guess if we are consistent with the parameters we use then it should not make much difference to the results we achieve.