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Just totally winging it here...but on landing, the engines aren't cranking that much and maybe jetwash is not a factor?
Dunno...no clue. >>
You are correct. Generally speaking, the only time you have 100% is during takeoff and climb. During landings in the little planes I fly the throttle is down to about 25% and when I've cleared the land or go-around decision point and I'm dead on for landing, I pull the throttle all back so that I'm essentially coasting in.
Still, with these big birds the wingtip vortices and wake turbulence alone are enough to cause problems. The FAA recommends at least two minutes between planes on takeoff/landing to let the turbulence subside.
I just linked the video because I thought it was cool.