I've got buddyclub rims which are 18x8 offset of +42 so the front does stick out a couple of millimeters on 225/40/18 and no problems to what you are describing...i had problems with steering wheel wobble but that was due to wheel wasnt balanced properly.... but no problems with the width and drifting to one side...
+38 is less then recommended, from wat i remeber it std is like +55 on the stock rims and should be around +45 to around +55...correct me if im wrong..
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