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I haven't checked personally, but since Mod of Balance 3.0 changed the class system around, I would assume that all twelve classes have separate level-up tables (in vanilla, basic and advanced versions of a class share the same table). So, most likely Jeff Ludwig relocated the levelup table to some place with room for twelve sets of levelups.
To find this new table I'd advise examining the code responsible for loading the levelup table and seeing what it points to in the modified ROM.