Thank you, I'm not a plugin expert, but it seems like that knob of input gain will be the solution. It should not affect the sound level in DAW, only the graphic level in the plugin.
In addition to the above, it would be great, but it may be a bit complex to create, a button that when checked, will automatically normalize the last maximum peak level and put it in the zero. This will ensure that the plugin width is used all the way and that we are not missing some peaks that go above the zero line—just an idea. Maybe you will figure it better.