You've gotten good advice here. My gut response reading the title of your post was, "Why worry about the evenings? If you need to increase your supply, you should increase it overall." Lower supply (and fussiness) in the evenings is normal, but if your supply is generally good, that's fine, and it all evens out. So your supply in the evening may never be as high as it is in the morning (my supply is still highest at night and in the morning, and my LO is almost two!), BUT, that's fine. Baby adjusts.
It sounds like you are doing all of the right things to increase your supply! I would keep up the good work, and not stress too much about the evening fussies. I know, easier said than done, right?