A couple things are happening aerodynamically as you get closer to the ground. You are entering ground effect while airflow is still over the wing, and at the same time you are translating back into the hover with airflow being forced downward through rotor. As you enter ground effect you need less power and almost simultaneously you are in the hover and need more power. The key here is to slowly add power as you settle into the hover. Unfortunately many sim helos need much more power to hover than the actual aircraft would. So you will have to experiment and see what works best for where/when to add power. As with any aircraft, smooth application of power and/or flight controls will win the day. To practice specifically the T/O and Landing translations, I air taxi around the taxiways of an airport, using the taxi lines as reference. Accelerate and climb a little, then decelerate and work on the translation back to the hover and then landing. "To fly is heavenly, to hover divine."