I have rarely ever had the BA reach it's max torque and only on cooler days at lower altitudes. At 4000' and 40C you won't even come close on torque most likely NG. The BA is a great machine And flying tours you will probably be able to get 6 pax plus 50-60% fuel which makes it a lot more useful than the 206L.
If you have never flown the AS350 what I found useful when starting was extend your little finger down the shaft of the throttle so the back of your finger is flush to the back of the throttle. Then when you advance it forward it usually will light off around when your little finger hits the first notch of the throttle casing then you just have to back it off a little and wait and you know exactly where the throttle is at all times by feel. It's an easy and fun machine to fly with lots of tail rotor authority just don't pick up bad habits and fly it like a Bell and you will never get in trouble.