You must be running in the Nitro Mains.
2650kv on 4S 5000 mah, 14T pinion
1900kv on 4S 5000 mah, 19T pinion
1700kv on 5S 4000 mah, 17T pinion
1350kv on 6S 3000 mah, 19T pinion
You might also look at a 5500 pack. That would get you there with a little to spare.