usher 6 series speaker placement

My room is 25'x30' and have the Usher 6371 speakers.
Mine are placed 30" from back wall and have no side walls. Wide room :) Have them placed about 8' apart. They are now spiked and leadshot filled. Now that I got to live with them in that spot for a week I feel they need to come out from the back wall some. Bass is a little boomy. Especially when I crank pop rock music. I also have them toed in to the point where they cross over behind my sitting position which is 12' from back wall.
Rock solid imaging.

with the 6381 from usher i needed a good 34 inches from the back wall to the back of the speakers,that was in a 13 by 18 foot room.
i found them not to be toe-in friendly, a slight toe-in just to get the focus right on the ball, about 7 degrees
inward toe-in.
depending how you have them setup give them at least 28 inches from the side wall to the center of the speakers.
hope this helps you out.