You should try spending even more money on TTI's and having the same experience, they're not any better.
Like I said at the beginning of this whole mess, these cars have 1/4" production tolerances, and in many cases the clearance to the headers is 1/8" or less. Think about that for a second. One size does not fit all. It's not on TTI or Doug's, they're trying to hit a moving target. Add into the mix the fact that we all use different aftermarket parts and you just get what you get. TTI's fit some cars better than others. Doug's fit some cars better than others. Only way to know which one will fit YOUR car best is to buy a set and try it. The Doug's on my Duster fit great! The TTI shorties I bought to replace them to gain a little more ground clearance didn't fit as well as the Doug's did, even though the shorties should have been an easier fit. Just the way it goes.