You can get a larger sized tank that is the same tank (unless in the UK) so that might be an option.
However, you can really put any tank on there your heart desires, keeping in mind if the diameter is too large, it won't fit. But, otherwise, as long as the coils you use with the tank you select aren't insanely sub0hm, (your battery life would be poor) you could use whatever tank you like.
It might help with recommendations if you let us know the coil you are using, wattage level, resistance and etc.
I found the Melo III too airy for my liking, but from the sounds of things, you sort of like that "crossover space" tank, where it's a restricted lung hit or a very airy MTL hit? But I am just guessing at the moment.
Best of luck,
Anna