Seriously though, maybe the best tweak is exercise?

I've been an endurance athlete pretty much all my adult life.  I did triathlons and distance races in my 30's and 40s.  Marathon was my best distance.  Now that I'm older I'm dabbling in ultramarathons.  I work 4 days a week and any day I don't work I hike or run at least 13 miles in the morning.  

Instead of energy drinks I'm generally having protein drinks in my listening chair but it is much easier to stay there and relax for a while after a good workout.

Jerry

An occasional ear cleaning with a peroxide based cleaner has improved my hearing quite a bit. Hadn't even considered this as a tweak but, man has this worked for me!

Yes, yes, and YES. To put a label onto why exercise improves enjoyment, I can't say but it is a thing I've experienced over and over again.

Another thing that always work for me is coffee. Raises my alert level and I bet this also improves my hearing in a way or two. 

I also believe a good ear-cleaning regimen goes a long way. Something very few of us have and Q-tip is NOT the answer.

Don't forget sleep! Big influence on mood which affects your listening enjoyment. I unsure about actual hearing though. Thanks for the encouragement to get more cardio, maybe that will help my ringing.