Because of scaling, I would say Stick that you should work really hard for spesh.
Whereas methods can only ever be equal to your score for further, meanwhile spesh can scale above that magical 50.
Clearly getting 50+ for spesh is seriously tough, but that should really be your aim. With scaling from 2011 and 2012, you need about a 39 raw score to get above 50. That's like a low A+ for SACs and exams.
Throughout the year, if that 50+ is looking like a possibility, work really hard for spesh and also perhaps do less work for methods and put that time and effort into English which will definitely be in your top 4 (and hence 10 times more important to your ATAR than methods in your bottom 4).
If the 50+ for spesh isn't looking likely, ie your SAC marks are below A average, then maybe do the reverse of above - put more time into methods, less time into spesh and instead do more for English.
Alternatively, option 3 is to just work your hardest for all your subjects and whatever happens will just happen.
'Problem' solved