Buffalo is correct, you look like a strong candidate, but they are concerned about your physical fitness. The key is that the AFA looks at the CFA because the altitude is a killer when the cadets 1st get there for BCT. The last thing they want is you to not make it through BCT because of your physical fitness abilities.
Do not rush it in hopes of getting an appt faster. Instead, take your time and try to max everything, or at least show great change in your scores. Remember, the files do not close until Mar 1. If you use the next 6 weeks to dedicate for the CFA you will increase your chances of an apptmt.
Also do not think they look badly on you because they requested it, instead look at it as they believe in you. They don't offer every cadet the chance to re-take, only very few special candidates are given the ability to re-take. This is why I always stress make sure you submit the absolute best CFA, because once it is done it is locked unless they re-open it for you.
Good luck.