Playing against 3W-1-4-1-1 tomorrow, I'll use 4-5-1 V-Style as suggested and this is my strongest formation.

What I'd like to know is, why is 4-1-2-1-2 Narrow Diamond best vs 3N-1-4-1-1 and 4-5-1 V-Style best vs 3W-1-4-1-1?

Shouldn't it be the other way round? So you'd have 2 wide AM vs a narrow defence (3N) and a narrow AM and 2 ST vs a wide defence (3W).