There is an additional factor worth considering in the use of filters with differing bandwidth: exit pupil size.
I use filters of different bandwidths for different exit pupil ranges with some variation based upon individual target. These are the filters I use:
Farpoint UHC (28nm bandwidth)
Optolong UHC (~50nm bandwidth)
Astronomik B-band deep sky imaging filter (~92nm bandwidth)
I find each of these filters useful depending upon the exit pupil and target object.
As a general rule:
Farpoint UHC is used at exit pupils of 2.0mm and larger
Optolong UHC is used at exit pupils from 2mm to 1mm
Astronomik B-band is used at exit pupils from 1.7mm to 0.7mm
So based upon my experiences the Lumicon deep sky filter (~70nm bandwidth) should be useful at exit pupils smaller than 2mm. Last time I was out I found beneficial gains in contrast using the Astronomik B filter at exit pupils as large as 1.7mm.