Hmm, well again, I largely think it is up to you. Are you willing to fully dedicate yourself to improving your score, even if it means many hours of sacrificing personal time (or time that can be spent working on other aspects of your application, as for me)? That was a very tough decision for me to make. But if you think you can do it and wholeheartedly want to put in the strenuous effort, you may be able to bring up your score. On one hand, a year may be enough time for you to get in some more science classes and to bring up your verbal if you continue to work on it, but it will take a lot of reviewing to do again next year, if you're anything like me. I think you are the best judge of your own potential + willingness to take this on. My advisers say 30 is "the magic number," to get in somewhere and the fact that all your sub-scores are at least an 8 mean that you may be fine as-is, although certainly nothing is guaranteed.
For me, I did not reuse any old practice AAMCs because my subscription had expired through my test prep company (over which I had become very upset about due to their "satisfaction guarantee" which ended up being a load of bull), but I did use the free AAMC 3, plus assorted Kaplan and TPR exams I found at bookstores and hand-me-downs from my friends. I definitely had enough materials with which to keep busy. For me, I have really good recognition skills, and it would have been a false sense of security to use tests I had already taken, even a year ago.
If I were you, I would certainly work on clinical experience, like job shadowing and especially clinical volunteering if you can. And whether or not to retake is justifiable either way, so I think it depends on your preference. Thanks for the luck wishes and same to you!