That's a lot of plane for 6S. Might try 8S and a lower KV motor. Of course, that's a pretty big change, both battery and motor. But do you see why not giving that information makes a big difference in the answers you are going to get? 3300 mah isn't a lot of capacity when your power system is drawing 75 amps. Remember, amps don't fly the plane, watts do. Amps x volts = watts. You can up the voltage and lower the current and still make the same watts. And what does lower current do? It gives you longer flight times or it allows you to run a smaller capacity battery and... and this is a big and... higher voltage is more efficient meaning your entire power system runs cooler.
 
Next time you size a power system for a plane look at going up to the next higher voltage battery and run a lower KV motor. I think you'll be pleasantly surprised at how well it works.