Not sure if filling the bottles almost to the brim has any ramifications on beer judges, but when I fill my bottles from keg (~2-3 psi) I fill it til foam approaches the mouth of the bottle, slowly raise the beer gun and keep filling until all the foam is out of the bottle and a little beer overflows. I then cap and there is almost no headspace at all (maybe a 1/8 inch?). Rinse all my bottles afterwards, towel dry, ready to go. I also carbonate all my beers in the freezer at the upper end of the typical carbonation range for the style, so if I lose a little carb bottling I am still within range.