1. sounds very much like a problem with the front diff. maybe a chewed gear?!. I get 'spikes' in front torque when I go over slight bumps or pot holes and my gauge can reach about 40% and I think I remember it staying there until I released the accelerator....possibly!
2. I get a similar noise, but thats the fuel pump starting up in mine I think. You might have a loose line or something. Any fuel leaks under the back of the car? check the fuel lines under the car as well.
3. HICAS problems in a 32? check power steering fluid level, after that blame the guys who last mucked with it, presumably the place that installed your rear diff.