Almar;
Man, I'm sorry to hear the Sassafras is messing with you. One question. The bottom of the box had the driest and longest dead wood in it. I was wondering if you had used it first, or if you mixed it up? The reason I ask is all the wood I've made powder out of until this last Black Willow, I've always cooked green. It seemed like I could control it better, the way I cook it. I know there have been a few conversations on here about dry or green. It may not make a hill of beans difference, in the finished product.
I was really hoping that it would do you better, being it has been my fastest pucked and screened powder. But, I'm also shooting a .58 caliber rifle with a 40" barrel. I have no idea if that would be a variable of vast difference, or not. I hope you can make it at least do as well as your other powders. Keep us informed and good luck!