I sow seeds on a compressed channel of newly purchased multipurpose compost. It is approximately 2 inches wide by 1 inch deep depending on the seed. The seed is then covered with new compost.
To that end, the compost you have laid on your soil will be fine for regenerating the soil. By using the method above, you are only using new compost where you are sowing seeds and not wasting loads all over the place so to speak. The multipurpose will be nice, fresh and loose enough for seeds to germinate. ;)