You actually might have two problems.

To go with Pro's comment, there's another (at least one) shock bracket that is more "upright" than the one you've got, doesn't have that slight "S" pattern to it. It will make the shock lean in at a steeper angle. See the pic here: http://www.peteandjakes.com/parts/05.htm

Second, you may have the wrong shock. There may not be enough travel left with that one. On a good bump you're going to bottom that one. Once you get it loaded with full weight check it out. On the same sight as above they have shorter shocks available.

Just going to a shorter shock wouldn't solve your original issue except at static height. On compression you'd still have interference.