Setting each speaker to small with a 60hz or 80hz crossover point will definitely take the stress off those drivers during those scenes at those reference levels. Having the M80's set to large you are asking those drivers to produce low frequencies at high output in those movies which they are not capable of and are becoming distressed and bottoming out as noted by the "fluttering" sound.

I would recommend a subwoofer to fill the area between the 80hz to 30hz/20hz region.

I’m armed and I’m drinking. You don’t want to listen to advice from me, amigo.

-Max Payne