Get yourself a little powder grinder from a headshop. Works wonders for getting the finest, fluffiest powder possible. Mine's been put through so much use that the handle broke off and is now substituted with a paper clip. Will be getting a new one, since they're so handy.
Also, snort moderately hard. Too hard, and it will just fly down your throat, too soft and bits will fall out/not be absorbed properly. Just try a few lines with different intensities and figure out what gets you best.