Oldsmellhound , remember 3F powder is about 15% hotter than 2F. I believe I would try going back to the 2F powder for a slower burn time and drop your charge to about 90 to 110grains . Now if you were just whating to use up the 3F I would drop your charge to about 80 to 85 as you did in the CVA .
Now for your fireng problem try using the Winchester W209 primer in the blue box I think it will help.