1911, I did like you, I actually got similar results as you. I found I was getting better results from the fire forming stuff than factory brass. I have found a node between 41.6 and 41.8 so have settled on 41.7 There was a node similar in the 42's but living in Oz with the heat of summer I deliberately keep it on the lower side due to the pressure signs showing up in summer time on the hotter loads. I am using convert cheap federal and Winchester brass too and I have doubts that it is off that level of quality.