With a 2.5ohm DC, the amp limit for the LT isn't going to be a factor. It'll still give you pretty close to 6V because the it's only drawing 2.4 amps.
The problem is that you're not going to generate enough power. Even at 6V, you're only going to get barely over 7 watts per coil.
That's not terrible, but you can use a 2.5 single coil and generate 12 watts at 5.5V. That's fewer watts in total, but it's not split between 2 coils, so it's a warmer vape.
I use a 2.3ohm Vision Stone tank on mine and it's a vapor beast. I get nothing like that with a DC carto.