I have the Thiel CS2.4s and can't imagine a problem with imaging. I have mine nearly 9 feet, center to center and sit about 11 feet from them. I am using a total POS Sony DVD player ($160.00 at Good Guys) and I have a great soundstage and imaging with my Rotel integrated doing the DAC work. I think your inital problem is indeed speaker placement. Try moving them further apart temporarily and with a slight toe in, maybe 5-10 degrees. I actually moved mine so far apart at one point that the center image started to disappear but a few inches closer and they snapped back into line. Also, how far from the rear walls do you have them?
Good luck, I love my Theils as do many folks on agon from what I have read.
Good luck, I love my Theils as do many folks on agon from what I have read.