I see the same bulge in the SkinTight case with my 7290 -- with or without the screen protector inserted.
The 7290 is 0.9 inches deep, while the 7230 is 0.8 inches deep. That 0.1-inch difference may not sound like a lot, but it's more than a 10 percent increase in size.
That difference may account for the bulge. The bulge is less pronounced with my 7230, which has eGrips installed on the back and sides. I wasn't willing to peel off the eGrips, so I can only assume the bulge would disappear on a 7230 without the eGrips.
I plan to post a full review of the SkinTight case when I get a chance. Overall, I do like it.
DavidE
www.davidenglish.com