I havent tried a LR DCT, but from what I understand, it's da ..... Unfortunetly the lava tube can't handle the amperage. What about adding a 1ohm resistance to it (say at the connection)? The obvious drawback is that it will reduce the current and thus the wattage, but it's still more watts then with a 3.7 battery. This would only be a fix for those that have LR DCT's and no other VV but the Lavatube.
3.7V with 1.5ohm - 2.5A, 9.13W
6.0V with 2.5ohm - 2.4A, 14.4W
6.0V with 1.5ohm - 4.0A, 24.0W
3.7V with 1.5ohm - 2.5A, 9.13W
6.0V with 2.5ohm - 2.4A, 14.4W
6.0V with 1.5ohm - 4.0A, 24.0W