I have a f550 need more flight time

I am getting 4min of active flight time and would like to increase it to 15 + min. are bigger motors and larger batteries and props the answer. I have all stock DJI equip. I am aware of the law of diminishing returns. Please help me figure this out. Thanks
 

Sure thing!

The F550 ARF kit comes with 8" and 10" props...which ones are you currently using?
What type of battery are you using?
When you say that you're getting 4 minutes of active flight time, do you mean that you have four minutes until the 'low voltage' warning comes on, or four minutes until the battery is 80% drained? If the former, what are your voltage settings in the Naza software?
 

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