Can I ask why you are so keen to start ATPL in March? Do you have a course booked or is it just your personal agenda? My reasoning is that you are inevitably going to do things more slowly than you plan. Casting aside the whole lengthy discussion about timing and global economics (there's a big thread on that), you will find that weather, aircraft serviceability, course availability etc will always play a part in your training.
Personally, I would stick with what you have (you know the school, instructors, aircraft, environment) and just accept that things may happen a little more slowly than you wish.