I use the 4-5-1v so I could give you an insight to the strengths and weaknesses.

I normally struggle against teams who play 3 in the centre as they out number my 2 CM's.
Playing an attacking mid against the 4-5-1v is more or less useless.
The 4-5-1v is a wing based formation but also leaves itself vulnerable to wing based attacks.

If I were you, I would probably consider 4-3n-2w-1 or 3-5-2v depending on the strength of your attack and defence.

Hope this helps.