Certified GKH Gardening Expert
Aerating may help, but the compost certainly will help. Have your soil tested as well and see how your pH is. Apples like a pH of about 6.5-7. If you fall above this or below this, then adjusting for the pH will also be helpful. A soil test will also let you know what your soil is lacking so that you can amend for this too.
Here is more information on getting your soil tested: