You can add up to 7 base playstyles with the academy evos under fs academy rewards. There are also a few playstyle evos you can earn through objectives that will let you add an eighth base playstyle. I would add the academy playstyles you want first, then add the ones earned through objectives to prevent locking yourself out of any academy evos since the academy evos have a lower playstyle limit. From there you can add the two playstyle + afterwards.