Quote: 20% more or less than the states weight is a DQ. 20% of 36 oz is 7.2 oz, so a cock weighing less than 28.8 oz or more than 43.2 oz should be disqualified. A bird closer to the prescribed weight should place over one that is of equal quality, but farther from the weight. The standard is a bit unclear on a bird that is closer to, but above the weight versus one who is farther from, but below the weight (equal quality).
I do not think that there are any good general assumptions about weight and over versus undersized. What one breeder experiences may not be what one with different lines encounters. Also, some lines develop more rapidly or slowly than others, and that can make difference in weight, too (none of my 4 month old silkies have ever looked as mature as the bird in the above photo). If your birds are overall too large, I would suggest getting birds that are on the small side and breeding to them. Or vice versa.