GunnersFan

I normally use my own tactics and they're decent to a certain extent but my defense always leaks to many goals for my liking.

I'm hoping someone will be able to give some advice or tell me what I'm doing wrong. Here's my defensive set-up:

Full-backs:
Mentality: 7
Creative freedom: 7
Passing: 10
Closing down: 13
Tackling: normal

FR: mixed
RWB: mixed
LS: rarely
TB: mixed
CB mixed(deep)

Marking: man

Centre backs
Mentality: 5
Creative freedom: 5
Passing: 6
Closing down: 5
Tackling: normal

FR: rarely
RWB: rarely
LS: rarely
TB: rarely
CB: rarely

Marking: man

Other info
Defensive line: 6
Width: 10
Time wasting: 10

Any help would be greatly appreciated