1) You'll get some reduction due to the duty cycle, of course.  But I think the main reduction won't be seen for LIN/SAT, because the channel still exists, and the trapped carriers aren't freed.  When doing OFF/SAT, the channel disappears in OFF and the carriers are much more likely to come out of the traps than go in, so when the next SAT portion occurs, there are far fewer trapped carriers to be causing the flicker noise.