Black Fox - it might help if you told us what the helicopter type is.
The lower speed torque spike might be explained by the immediate precursor to ETL which is a higher rotor drag due to the tip vortices - many don't notice this but do see the reduction in rotor drag as ETL is achieved because the aircraft wants to climb. Max power required for a cushion creep style take-off (limited power) is always just before the onset of ETL.
The higher speed torque increase is more difficult to explain, especially without knowing what the aircraft is.
PS - by take off, we assume you mean transition to forward flight since the take off is what gets you to the hover (unless you are doing a running takeoff).