Can't really say iv'e noticed it getting any worse at the Loughborough cinema in the 35 years of watching there. The avengers was all in check today, though I did think the apes film last year was a little ott.
End of the day you can't please, make allowances for everybody. As a suggestion, maybe ask the cinema if they would be welcome to showing the film/s at a quieter volume during a non busy screening time ( first morning show ect)
I doubt they've even considered it, they do make allowances with extra screenings in Loughborough for wheel chair access in different screens.