I use the same formation and tactics all season unless i have injuries. I have won - 5 leagues - 3 cups and 4 CL's in my 5 seasons. I really really think counters are rubbish. Oh and i'm a 35T a season kinda girl!
What a rubbish? you just need your own counters.
YOU're MANAGER, YOU MANAGE
Congratulation Arsenal!!
Hope these thread could help you, Formation-Tactic and GUIDE