On a side note and one thats most important when shooting BH209.
Have you cleaned the flash channel with an 1/8" drill bit to remove the carbon? Heavily fouled flash channels cuts down the amount of hot gasses able to get to the powder.
I had not cleaned it out like that till last night. I will give it another try this weekend and see if that has any impact on it. There was a bit of carbon in there but not as bad as I expected it to be.