Thanks for the message! The feeling you have is not abnormal at all! The LSAT is such a weird test because you don't learn it linearly, meaning one hour of study doesn't automatically translate into a higher score. That makes it frustrating. So, the first step is to take a day or two off, get a breather, and mentally regroup.
Second, I wonder if what's happening to you with LG is a byproduct of the clock being on. You mention that it all seems clear when you are watching, but it blanks out when you start. Have you tried turning the clock off and going slowly through a few games to see if that makes a difference? I'm thinking it might, and not only the lessened concern about the clock but even the slower pace might allow you to keep focused. I'd try that first because it will help assess what is happening to you when you start a game, and that's the first step we need to take here! If it is that clock, that's ok--then we'll know and we'll be in a much better position to start fixing that