I think that the biggest problem with your room may be the low ceiling. It looks like you have diffusion up there now, but you might find that absorbtion would be more effective. Also, the Auralex bass traps are woefully ineffective at frequencies <100hz where room modes and nulls will be strongest. I recommend that you look at RealTraps bass traps which can be effective down to 50hz.
http://www.realtraps.com/data.htm
As far as the X-2's go, bear in mind that many of them are sold in Asian markets where rooms are typically smaller than in the USA, and Wilson certainly takes this into account with the design (notice the venting for the bass is in the front rather than the rear of the cabinet, allowing for closer placement to the wall). However, given your low ceiling, perhaps a line-array type speaker such as the Dali egaline would work better in your room as these types of designs minimize floor and ceiling reflections.
http://www.realtraps.com/data.htm
As far as the X-2's go, bear in mind that many of them are sold in Asian markets where rooms are typically smaller than in the USA, and Wilson certainly takes this into account with the design (notice the venting for the bass is in the front rather than the rear of the cabinet, allowing for closer placement to the wall). However, given your low ceiling, perhaps a line-array type speaker such as the Dali egaline would work better in your room as these types of designs minimize floor and ceiling reflections.