Thanks for the help guys- I think I've finally got it sorted!! Still concede the odd one or two, but that's to be expected I suppose.
Basically I just play a completely flat back 5 ha- both full backs set to defend and three limited defenders in the middle- the central of which is 6' 4'' and has 18 jumping and 17 heading (he's a beast)
Then in tactics my defensive line in set as deep as it can be, width a couple of notches under halfway, and all the defenders set to only close down in own area with their mentality nearly all the way to defensive. Haha, but it seems to have done the trick! I then play a ball winning midfielder in the centre of midfield who patrols infront of them, two wingers either side who are set to support but track back too. Combine that with attacking players that are extremely pacey and creative/good in the air and I seem to be onto a winner.
Oh, and as for set pieces- I literally just set every single player in my team to 'go back.' Haha, but that works a treat too!!! Am I putting too much effort into this?!