If your temps are accurate, then you've got ~2 deg difference, between ambient and the water temp (+/- 2 or 3 deg), which is excellent. What did you do to that Aquacoil?
Otherwise, the problem isn't with the rad, it's with the fan: the axial fans aren't able to produce a lot of pressure. Also, your airflow direction acts as an added restriction.
Wait until I've got my blower up and running: you'll see