softening suspension damage it?

I drive a Toyota Mr-S and have installed a
BC suspensions. Settings are set to 9 out of
1 to 16 settings. Any tiny lump or bump on
the street gives a big reaction to my car
which makes it very uncomfortable. If i set
my suspensions lower to soften the
springs, will it damage my suspensions?
and is there any other parts of my car I
should look into to minimize the sensitivity
of my car? Thanks