Sambow, look at
this video. Its particularly obvious when the arrow hits the target in what direction its bending. As i said, there will be *some* left right bending, but this will be minor by comparison, else the shoot through compound could not exist!
Also, as i said, heavier point weights will effect the AMPLITUDE of the oscillations, and if these are too large the arrow will be unstable, as you quite rightly said, but i couldn't speculate on how they would effect the FREQUENCY, which is, after all, the important bit (especially on recurves).
Also, what constitutes a *heavy* point weight depends on the stiffness of the shaft (hence easton's different recommendations). So i guess it's safe to assume that the effect of point weight on AMPLITUDE is reduced the stiffer the arrow (as makes intuitive sense).
Hence there is no such thing as an arrow that is truly *too stiff* for compound, as in general its only the AMPLITUDE that compound archers need to worry about, rather than FREQUENCY, which is the major concern for recurves, and a stiffer arrow with the same point weight will probably oscillate with a smaller amplitude.
I have no idea as to whether point weight changes the frequency of oscillation, and is thus a valid method for recurve tuning. I wouldn't even like to speculate, as I don't know enough about the mechanics involved.