I'm well over half way though the posts and a couple of things stand out.

Weight seems to be over-rated, but can still be used as a guide to a horses class.

If your horse has drawn a bad barrier you'll be compensated by a better price. Some suggest that the price may be adjusted by far more than is deserved because of the perception of bad / wide barriers.

The number of days between runs seems inconsequential.

A horses odds seems to be a very, very good filter, and one that I had previously given scant regard to.

Be prepared for a massive run of outs.

Develop a system of "logical" rules then test. Don't backfit to find a successful system.