Turn!
zxcvbn,
Regarding keeping NR up when low GW; consider what happens when you flare or turn. As load factor increases NR climbs. If you've done any 180 autos you'll recall that you had to pull in some collective to keep NR from exceeding limits during the turn.
Thus, if you ever find yourself in a situation where you want to bring up or maintain an NR higher than you can get with a straight ahead decent with the collective bottomed, consider s-turns or spiraling down to your target.