I ran in the Ariel/Addictions (my last shoes) - I definitely think you need different shoes. I had a very similar experience, I felt like I couldn't run "correctly" in them without a lot of effort, but when I did, I felt great. You (and I) probably need a shoe with a less built up heel - I feel like the shoe made my heel hit even when I didn't want it to so I had to concentrate REALLY hard and then it wasn't fun.

I've thought about getting the analysis done at a PT rather than a shoe store - sort of like a bike fitting. I think they are less interested in moving people (and merchandise) through the system, but the problem is, you still have to go out and find shoes at the end of it. The bright side is they might tell you other things you don't know, like details about your stride length and posture.

I have heard good things about the Nike Frees, if they fit your feet you might try them, even if at first you're alternating with your current shoes. Nike shoes are always too narrow for me... most shoes are.