Like to tweak my system

With your current system your not going to get any "aha"moments with tweaks like power strips.
Is the room acoustics sorted out?You want early reflection points treated and check for room echo(walk around hands above head clapping loudly-you will hear it if it's there).Balance hard reflective surfaces with curtains,rugs & wall hangings..Also if you have a big tv in between the speakers get a good blanket to cover when listening,it will increase soundstage depth and height.
The Vandersteens are time aligned so they need to be perfectly aligned both horizontally & vertically.Use a bubble level for set up..
40' speaker cables?That's a LONG run,generally you want speaker cables as short as possible.Better to use a longer run of good Pro Grade USB cable...
 If you REALLY want to hear those 1C's sing add TUBES!A decent 40wpc.EL34 amp.will put you on another level with those speakers.

Okay so here's what you do: spend as much time as you can listening to as many different things as you can in as many different stores as you can find.

But that doesn't mean 100 systems in 50 stores. Lotta guys do this, learn next to nothing. What you do instead, every place you go, you listen to one system and then you listen to it some more after they have changed one thing. One interconnect. One power cord. One CD player. One thing.

Then you make note of everything in the system, or at least as much as you can. Eventually you are gonna be looking and asking and making note of things like was that left on overnight and if not then how long was it turned on before I got here? Because it matters. A lot. In the beginning though you got your work cut out just keeping track of the big stuff.

When you get to the point you're seriously considering buying something, bring it home first. Not just the one you're considering either but at least one other contender. No exceptions. Not in the beginning. Eventually, many years from now, you may reach a point where you feel confident enough in your detailed understanding of how each component works, how to read reviews and which reviewers to trust, to buy a thing or two unheard. But for now the rule should be, audition first.

This is a lot of work. So much work, hardly anyone ever does it. That's why almost all the advice you will get is buy this or buy that. Buying is easy. Listening is hard. But totally worth it.

Thanks for that advice, I really do appreciate it.  Doug