Chances are, for those who are scoring better on the Schweser practice tests, you have been studying Schweser and using Q Bank. Which means you are used to the way Schweser asks questions, so of course the Schweser tests are going to be easier.
Just do what everyone always says - get to the point where you score high on the Schweser tests, do all the EOC questions (with a focus on the topics you are weak in) and do the mock exam once you are comfortable with both of these.
In my opinion, the mock CFAI exam should be done after doing all your Schweser mocks and the EOC questions, 2 weeks before the exam. You’ll score better, maybe not perfectly, but it gives you the chance to accurately assess where you are at go back and review the areas where you are weak.
Good luck everyone and don’t freak out. You’ll all get there.