>By the way, do you think it's best to ignore slow and heavy tracks?

1. There's not as much form to go by, most racing is on good tracks.

2. The surface is usually inconsistent. An ordinary horse might get lucky and find a bit of good track, a good horse might get a really bad bit of track and get bogged.

3. It's more physically demanding to race on a heavy track. Different factors come into play than the usual ones affecting form on good tracks (corollary of point 1).

P.S Lay of the jumps too.