If the control arm is riding on the bump stop, it doesn't matter what you've read, you have too much lift. Your options are:
Get rid of the 3" spacer and get a shorter spacer, or cut the bump stop, but this will not provide you much travel and produce a metal to metal bang. Or live with it.
My suggestion would be get a shorter spacer, no more than 2 inches, and if you want more height, add in a body lift.
Or if you want a real suspension lift and can afford the cost of the parts and labor; http://www.doetsch-shocks.com/17.asp