200 C is hotter than you need. Lots of toxins at that temp. 230 is near combustion. You might as well smoke. Don't know how accurate your display readouts are, but if your leftovers are black the reading may be pretty accurate. If I were you I'd leave the water tool off (to avoid the variable) and find your lower vaping range. Even with a display you want to find the lowest point where you get good vapor, as well as the burn point (black remains-not bursting into flame), and use a happy medium temp.