First bring the power back.... 94% power with the nose down will make it impossible to use manual trim, for unreliable airspeed 4deg nose up and 80% power will give you strait and level with flaps out 10deg/75%
Well, your premise is ok, but your figures are not. Boeing's memory items are 4deg/75% (flaps up) and 10deg/80% (flaps extended).
And that won't give you level flight, it will give you a speed not below minimum, not above maximum, at any weight, and will give you a climb at low level and a descent at high level. In other words, it will give you safe flight without reference to other instruments.
For the OP, no, I've never been trained an unloading technique in the simulator. I've only read about it in my spare time.