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Boomerang after a few years in industry?

I left Big 4 as an A3 and I have now been in industry for 2 and a half years.  I did a year in IA and was promoted to a BU Controller for the past year and a half.  I have recently been questioning my upward potential at my current company and have considered going back to Big 4.  However, I am wondering how this works for people who have have been out for multiple years.  First, I currently make the equivalent of an M2 salary.  If I were to go back to my firm without losing time, I would be considered an S3.  Woukd they discount my time in industry and force me back to an S2 or possibly even S1 (which is obviously unacceptable)?  Second, I don't see how I could avoid a pay cut but how can I minimize?

Any experiences?