Any tweaks I'm missing?

I'm reminded of the phrase "when too much ain't enough".  But seriously, without a listing of your actual system and a description of your room along with a stated goal of what you're trying to achieve, then don't expect much from your posting.

I’m still thinking about the question. 

Ditto what the above posters said. All I can add is room treatment and meticulous attention to setup. 
The room gives, and the room takes away...

Are you using tube electronics?

Most tweaks are tuning devices--if they actually change the sound, whether the change is an improvement or a decrement, is a matter of taste and the specific implementation in a particular system.  With so many devices, it would be hard for you to even know what these tweaks are doing to the sound.  I think you should start by removing items to see what that does to the sound.  Given the number of devices you have, the possible combinations are essentially endless, but, at least this is a no-cost approach to changing the sound.

In my experience, the biggest changes come from power conditioning/treatment and from using systematic grounding devices and schemes (like the Nordost system).  You don't necessarily need rack space for power treatment, a very good power strip (like those from Isotek) can do quite a bit to improve your system. Power conditioning and grounding devices improve soundstaging and clarify instrumental timbre without dramatically changing tonal balance (meaning sound will almost always be an improvement).  Isolating platforms and feet also change sound a lot, but, because they change tonal balance, the change in that respect can be good or bad.  

By far, the biggest change occurs when you optimize speaker and listening chair placement and do some form of room treatment.  That does not necessarily mean buying exotic traps and panels--it could mean using spot rugs on the floor, tapestries on the wall, movement or addition and subtraction of furnishings.