Never add collective while recovering from Vortex ring state. Either enter an auto, or use the cyclic to gain airspeed to escape your downwash. It doesn't matter if you go left, right, backwards or forwards.
No that string is to help you stay in balance, it is utterly useless to judge the wind by.
- As has been said, you do not want to descend at greater than 300fps below translational lift with power (read collective) applied. Kinda fun in real life while training (obvioulsy not in any other case), and BS does a good job at it, even adding the buffeting and sloppy control effects.
It would be nice to have a wind sock at the helipads, I always look for it out of pure instinct when overflying the field. But it's not a big deal as they state the wind during the hover check. You just have to remember where the wind is coming from just like in real life!