I had my Schecter Hellraiser Hybrid C1 FR S downtuned by a whole step. It stays perfectly in tune until I use the FR trem. It goes out of tune at the slightest touch of the trem but is otherwise fine. This hasn't been a problem before it was downtuned, tuning was rock solid. It's a genuine Floyd with Elixir strings. Does anyone have any idea what could be the problem?