If the hairspring is perfectly clean (pretty clean is not good enough), then you have to observe it by using magnification eyeglass. Check out if the coiled parts are touching each other while the balance wheel is in motion. If that happens you need to recoil/repair hairspring and make coiling perfectly even. Also check out if the hairspring is touching balance wheel or coc;k. It must not touch anythining and must expand and retract freely. Coc;k is the bridge on which the hairspring stud and regulator (index) is fitted. When this is sorted but the problem still persists, get back to me again I'll guide you through the next stage of possible solutions.
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