So LR is your weak point? I tend to do fairly well with the arguments (missing an average of 3-4 per section), but have struggled with the games for months. I have, however, noticed some improvement (although I still miss 8 per section on average).
Your spreadsheet is much more detailed than mine. I do keep track of the % correct on each of the sections, but haven't analyzed it to the extent that you have. I might have to try it...