Hi guys I have a 2130 tank and I have a heck of a time getting accurate rate on small seeds. Canola is all over the place but always been plus minus 1 pound of desired rate. I lived with that but with innoculant it's dosnt meter really at all. New lid new seal. No leaks on tank I can detect. I'm guessing its a pressure issue. Dual pressurization valve is set correctly. Any thoughts?