As we have properly undewrstood your issue you are facing issue in volume increasement:
One thing can help is the following. Right click the speaker icon in the Taskbar and select 'Playback Devices'. Left click the default device once to highlight it ( it's usually 'speakers & headphones' ) then click the Properties button. Click the Enhancements tab and put a tick in the box next to 'Loudness Equalization'. Click Apply to save the change and then click OK in all remaining windows and see if this has helped at all.