If LTE was Vortex Ring, or interference from the main rotor or whatever . . . .
Then why don't you ever hear of people in Bell 407 (for example) ever getting LTE?
The answer is simple, that is because the 407 has a powerful, adecuate tail rotor, and the 206L3,L4 doesn't.
If I am correct the tail rotor in the 407 will provide adecuate control margin up to 35 knots of sideward flight, and the 206's will barely do at 17 knots, something to do with certification standards.
The 206 JetRanger dosen't get into so called LTE because it isn't very powerful, and thus you will run out of power before you run out of tail rotor most times.