GI Motorsport in Kilmarnock do ST and RS tuning now and have Collins performer mapping etc.

Any technical stuff or problems like you are suffering they call my mate who is a Ford master tech, who knows these cars inside out. He had a 340bhp focus ST and now has a 420bhp Mk2 FRS. He's the guy id go to if I had your issues. He's on Facebook if you wanted to contact him, it's ARC Tuning, or his own Facebook, Andy Clotworthy.