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1)i used to counter in first 3 l,now almost never.The leagues are full of bots and inactive teams so no use to do it.You play 5-6 serious games per season max in ur league and 2-4 max for the CL(no cup for me since they changed it).
So from what i have seen after 4 L playing the same formation almost my 90% of my games nope...no bother to count ur opponent.
But for the 10 max serious games per season yes i do counter ,i make some adjustments BUT i am sticked to my 4-5-1v style as my power are my wings..So i set up mixed formations around it with focus to my wings.(3-5-2V,4-2-2-2,4-2-1-2-1)...
i take notice for example if the opponent plays with no MR-L or AMR-L,or if he plays with DMC etc.

2-3)i think that a AML-L scores mores than a DML-L,but i have no proof of that.My wings are both AMR-Ls(R-L) than DMR-Ls ,they score almost the 60% of my goals so I can imagine they are better from a DML-R.
i have no clue about the DR-C (i think they perform the same in both positions ,i have seen some differences for the DMC-DM..some of them have better statistics playing DC and some at DMC.

as for arrows i think they do sometimes but i can't also proove it..Myabe it's my imagination that the arrows gave me the result or it was just random


4)Myth