1600 out of 3000, or 2600 out of 3000? If you're really using just 1600mAh, and you're not using the battery for balance, you can go to a lower capacity pack and lose some weight.
Get an AXI with a similar average power rating as the Turnigy, a similar weight, and a Kv of 900 or better (without looking at catalogs, that AXI 2826-10 may very likely going to deliver the goods).