testarossa,
interesting stats....there are varied opinions as to the effects of weight...stats show topweights win the most number of starts (as a ratio to the number of starters) and in fact an english writer called russell clark believes the disadvantages of weight are much overrated....he cites his own stats on english races which show much the same trend as you did....on the other hand i have followed with interest neil's weekly stats on horses carrying 59kg or more...they distinctly show a marked loss if you back these horses ....i wonder what the stats would be with topweights carrying less than 59kg??