[@Hantu Kongkek]
[quote]Devil Trigger (often abbreviated as D.T.) is a special power possessed by demons and demonic hybrids which allows them to release their full supernatural potential. While in Devil Trigger, the user will assume their true form. In this form, many of the character's physical and magical attributes are amplified, and the character may have access to upgrades or even additions to their normal abilities like flying or hovering.[/quote]
Taken directly from the DMC Wiki. Another thing you have to remember is that this RP isn't the game, and continuously healing wounds would be overpowered (at least if you ask me). One big heal to begin with is more balance, as it is a finite amount. 

That aside, for Demons the human form is sort of a limiter (if I understood what Lug said as being true), and the DT for full Demons are simply them reverting to their true form and full power. Doesn't really sound like just a marginal "Stat boost" if you ask me. DT might still be a "Panic Button" in this RP, but it's not just for the sake of healing (if at all). The way I see it, at least, DT should be used if the opponent cannot be beaten by any other means. A power-up, so to speak. Not an emergency heal and ability-booster.