I don't have the Triton 2 full, but I do have the Triton 1 (my nightmare, but I hear the 2 is better) But I can speak to their larger 1.8 coils....they are good. But tended to flood a bit for me. This was many tanks ago, so it's very possible that it's better now, or that it was just the tank. Someone else can probably speak to this better.
And ya, since you already have the Melo, might as well give that a shot first. Some places you can just order one coil at a time, maybe it's worth just ordering a single Triton 1.8 coil and trying it out for cheap.
And I hate to rave too much about the Nautilus X, but I really do think it's the best MTL coil option on the market with the ucoil 1.8's and with the 4mil extender. I'm not a fan of Aspire at all...but I gotta give it to em on redeeming this tank.
As Phil Busardo often talks about, so much of what goes into a MTL isn't just airflow or the ohms, it really is a complicated amount of things that work together to give that ideal experience. So even though a coil like the 1.8 on a Triton will do the job on paper, it may just not do the job in a Melo. But who knows. Of course, it's also very possible that I could be turning into a snob, and all of this is close enough
