The solution is simple: just make the loops longer. Some Audya styles have loops that last even 32 bars. If you consider that an average midi style lasts 4 bars and 8 bars are already considered an exception, you will see how, after 32 bars recorded live, nobody really notices if a drummer is repeating himself, also because at that point you will probably already have changed variation (and introduced another 32 -different- bars), and by the time you go through all the four variations you will likely have reached the end of the song.