5 head goals in 2 matches

[Eugen Cristea]

Hey guys
I am still at level 3, but the 1st on my league thanks to a great team. My only problem is that i am accepting so many head goals from corners, although my DR has the air defender ability and both DC's are 6 stars!!!
Any suggestions?

Do they get good ratings?
Because if they don't, they:
-conceed the corners
-don't clear the cross
And the keeper is important too, if he gets good greades, he should be able to catch the cross, most of the times.