Do not add maida more than mentioned. Because maida makes poori to be soggy not crispy.
It's chiroti rava that keeps the poori crisp for longer.
Kneading the dough stiff is also very important for the good results.
Do not let the dough balls get dry which will make rolling difficult.
If you find difficulty in kneading dough, you can sprinkle very little water but do not add more.
Check oil for the right temperature by dropping a pinch of dough, if it raises to the surface immediately, that is the right time to drop poori for frying.
Keep the flame medium while deep frying.