2 cents worth, after many MANY years of research of mainly Pre-Post favs, and every filter known to man (inc the ridiculous)

The end result, and I'm not taking thousands of races I'm talking about 10,000's races, is:

most of the fav filters do indeed increase S/R (minimally) but in every scenario the dividend /(SP) spirals in exact proprtion (down that is)

having said that there is certain combinations of filters that produce break even situations year in year out, now, therein is a hint of wealth!!~