Thatís a lot of panels.. Many different types of panels is not optimum for maximium output but your output should still be much greater than you are getting If you think the batteries may be regulating try turning on some loads (lights etc) and you will see the output from the solar panels rise.
Get yourself a clamp on multimeter and measure the output from each panel. My guess is you have some defective panels or wiring somewhere. With that many wires and connections outdoors the potential for such as problem is high