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I started using OSC Dualband filters just over 3 years ago with my ZWO2600MC under both Bortle 8 Sydney skies and South coast NSW dark skies Bortle 3
Bought the ZWO Duoband ( Ha 15nm and Oiii 35nm ) and used it for 9 months with mixed results , no so good under Sydney skies
Then upgraded to the L Extreme ( Ha 7nm and Oiii 7nm ) which resulted in a significant improvement overall from the ZWO , but with halos around the larger stars
Last year I upgraded to the Antlia ALPT OSC Dualband golden filter ( Ha 5nm and Oiii 5nm ) and it’s been a game changer especially in heavy light polluted Sydney skies . Work’s unbelievable well too in dark skies
To answer your question, yes the L Extreme should make a significant improvement to the ZWO Duoband under all types of skies , at least that’s my personal experience
I image with Newts from 900mm to 1280mm focal length
Hope the above helps
Cheers
Martin
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