Cleaning and scrapping more often stops the drip. Sharpen a thin stick to scrape around the bottom of the pot especially around the valve and the inside and your dripping will be way less. Use a paint stick split 4 ways and sharpen the end a bit, you will be pleasantly surprised. As the stick starts to turn black, the Carbon lifts the garbage up to the top. Place your partially burnt stick in a safe area when done, as it could start a fire.
Its been at least 5 years since my Lee pot has been empty, always full and clean