Problem with Sonic's shoes?

[Velen]

With my latest texture in the Vault: Tronic. There is a texture problem that needs addressing before I think of making a Color Pack. When his shoes are in complete shadow, the outline of his original shoes appears. I made the environment texture on his shoes transparent, so I dunno what is causing this problem, or what should do about it.\\

Does anyone here have any answers, or had any similar problems? I would like to make a cool looking Color Pack and Revamp for the texture.