Depends on your tactics... your FCa should be often to play off the shoulder of defenders (however during a match if he's caught offside too many times, reduce this) and your FCd should be mixed, so he can drop a little deeper to link up the play (again, reduce this to rarely if he's not seeing much of the ball so he can drop into space) BUT NEVER have both on forward runs often as this will seperate your strikers from the rest of the team!!!