I suggest you might want to think about a private pilot course here in the states. We teach pilots a few things about helicopters before letting them loose.
Remember this quote?
"I may only be a pilot but I did learn a little bit about them before they let me lose on them."
Or did you actually mean lose? LOL
The weight of the blades is included in an aircrafts empty weight. You increase the weight of the blades, you lose useful load. The only time heavier blade will require more torque is when you increase the grossweight of the helicopter thereby increasing the lift and drag produced. But at 2500 pounds, the torque needed to maintain RPM is exactly the same with light blades or heavy blades with identical airfoils.
And as for the tailrotor, the Robinson tailrotors are the most efficient there are. You can pull 100% torque from the engine and the tail rotor can easily compensate. I would bet that every instructor here has pulled in more than the limit manifold pressure on an R-22 more than once with no LTE.