If the naans fall off, it's not hot enough
If the back of the naans are burnt, it's too hot
I'm afraid you just have to work out, how it performs
My tandoor is gas, and takes about three quarters of an hour to get to "naan" heat
Even though I've been cooking with it, for seven years, I still get hit and miss results on the breads
The tikka is comparitively easy
Most of my Asian friends cook, the majority of chicken tikka, after the tandoor is turned off
This is because it burns very easily
They normally cook, 24 hour marinated half chicken breasts, on skewers
It's heated up as required in a microwave
They do cook fresh, if they run out, but that is quite unusual