using a 1200 bulk fill for the first time and large seed is giving me fits!  seed is 58 to 64 pounds per bag, and am having problems with it bridging in the seed tube manafold.  am using what i think is a generious amount of graphite (half a bottle/12 bags)  have been running the air from 2600 to 3300, vac at 18 to 22.  once i get it to the Minnie hoppers, it plants fine according to tho monitor.  yesterday 2800 fan and 18.5 vac was the magic setting.  today, nothing seams to work.  wondering what any of you are doing?  have 50 bags of 64# seed that i am going to send back for a different variety unless you guys can help me out?

thanks

SR