Yeah, I shook mine, too. I can wait all night for it to drain, so that is not the biggie. Like DGF, I just don't find it to be very good and there is not much of it. The 45 works great for me.
Strange that the 90 was lighter than the 73--you'd think the finer bag would strain more of the leaf material out. Too, what you end up with in the 90 micron bag is everything between 220 microns and 90 microns.