Once you start your application, there could be a section under addendums where you can simply check a box to indicate that you would like to have your app held until it can be reviewed with your January score- this was my experience with the apps I am working on as I am in the same boat you are. I have yet to see a request on an app to write an addendum explaining, rather just the indication that your score is incoming, but I am not sure if it is the same for all apps. Cheers.

I would do a PT (one of the more recent ones such as 90/91/92) and blind review it. See where you are at and what question types you are currently struggling with the most. Use the analytics feature to create problem sets with the question types you are struggling with so you can drill efficiently. If need be at that point, review the core curriculum sections to solidify your knowledge. This is what I have been doing to prep for a January take. Good luck you got this!!!!

Just wanted to say I am in the same boat as you with the PT vs. real test score discrepancy, and am now taking the Jan test to try to get a decent score so I can apply in good conscience. It isn't too late and we can do it!!! 2 months to study, we got this!