1)If you can master the games section on multiple preptests, you are unlikely to run into something on test day that you can't handle, and you'll have almost a quarter of the test sewn up. That can only help if you are trying to ace it. Games are the area of the test that it's easiest to improve on; you have two months, and are in great shape.
2)I had started at a 165, scored several 170's pretty soon afterwards, and after almost two months of prep I was still averaging a 170. I couldn't finish games. I got 1-2 wrong on each LR section, and did well on RC. It wasn't until the last week of May and the first two weeks of June that I started doing better.
I had worked through the Logic Games Bible early on, and had found it very helpful, but had plateaued, so I went back to it in late may. I went over the concepts again, and drilled LG section after LG section. I also spent a lot more time going onve the games I had trouble with, analyzing how I could have saved time, and determining a better way to attack them. At the same time, I started doing newer preptests, which I found had easier games in them, and less questions per section. That is a definite trend over the last several years, IMO. In a single day in early June, I did one preptest from 1996 and one from 2004. On the 1996 test, I barely finished the LG section(still an improvement over my efforts earlier in the month). On the 2004 test I finished the LG section with six minutes to spare.
Over those last two weeks, I averages a 174 on preptests, and somehow, on test day, I pulled off a 178.
3)In addition to the Powerscore Logic Games Bible, which I used and recommend, Powerscore also sells "The Ultimate Set-ups Bible" which shows their recommended set-up diagram for every released logic game over the past ten years. I didn't get the book, but it sounds like it might be helpful to you.