Oh dear, you're going through what I did.
Don't play anything but defensive, normal only when you have to. Always play high pressing. Short passing is ok but if they play 3 in their middle then switch to mixed. Man to man works perfect as its a defensive formation but combined with whole press it'll drain condition so don't use if you playing 2 games a day.
Problem with 4-5-1v is it's now a strict counter formation so you won't get a lot of chances, used right you'll minimise chances against you.
Last season I lost the title with it by a point. This season I switched to 4-1-2-1-2 and its solved all my problems.