To compare export and import rates is to compare apples and oranges. The two are are not directly comparable because they account for different things.
When consumers buy energy they pay a bundled rate consisting of four things: wholesale energy costs, network infrastructure costs, regulatory costs, and retail operation costs. Whereas when they sell solar power in exchange for an FiT (Feed-in Tariff), they—like every other energy generator—can only sell the energy generated. This explains why export rates are lower than import rates.
If you are wondering whether the FiT you are being paid is fair, the best comparison would be to compare it to the wholesale value of rooftop solar on the NEM (National Energy Market) over one year. You can do that by using the OpenNEM website to check the price of 'Solar (Rooftop)' for your state:
PS: Note that these prices are listed in $/MWh, and that you will need to divide by 1,000 to get the fair price in c/kWh.