Remember a few simple rules for landing on the Mi-8. Do not under any circumstances make sudden decelerations in the air (leads to a vortex ring). When landing, it is not necessary to look at the pitch of the main rotor, it is enough to observe the variometer and not go beyond the descent speed. 3-4 m / s is more than enough. In preparation for hovering, the pitch of the main rotor should be increased as a result of the transition from the oblique flow to the direct flow and a decrease in the lift of the blades with a decrease in the forward speed of the helicopter.
Misconception, power is enough. Vibrations are caused by the main rotor aerodynamics. The approach is recommended upwind. Approach is allowed with headwind and crosswind, the speed of which does not exceed 10m/s.
You can take some information from this website (RU) http://hvash.com/index.php/vertoletovozhdenie/19-osobennosti-pilotirovaniya-mi-8mt-mtv