Interesting experiment. I have the slightly earlier AyA Number 4; which is a bit plainer and less figured wood than yours. I never have patterned mine. I tend to use it for rats and small crows around farm buildings. Might be worth getting it on the pattern plate sometime as I have a similar experience as you that they are either missed or well hit. A little English double hammer .410 seems to give me more consistent performance. Probably as you have found; too much choke. Lagopus.....