Good shooting at a surprisingly tricky target, Bob. I'd have aimed for the center as well.
2 of my sets were too bad to post. Got lucky one morning slight overcast, warm weather and zero wind. Used my .40 Kibler SMR. 60 grains Goex 3F .015 ticking patch with TOW mink oil, and a .395 Hornady balls. Frankly I have no idea how I got this lucky.