zavato,
If the mess of wire looks like this you're okay.
https://systems.audiogon.com/systems/8367If not, make it so. Improvement in sound quality guaranteed- and free!
Check out the system pics. Do not "play around" with speaker position, but do try a few very fine and precise adjustments. If you have never done this you may be surprised how much imaging performance is lost in even the tiniest asymmetry.
The very effective approach no one takes because its so time consuming. Which is your goal. To consume time. So no excuses! Use a tape measure just like in my System pics. Measure 3 corners of each speaker. If your room is symmetrical then measure from the side and front walls. If not then use the tape to create a line between them and adjust to make it perpendicular to your listening spot. Then measure and finally eyeball to make them perfectly equidistant and with exactly the same toe in. Notice in my System description Mike heard pinpoint imaging in a wide fat stage? This is how its done.
Well, one part anyway. But a big one.
VTF- you checked. Great. All that means is you're within spec. Which is a range. Within that range VTF is set by ear. If you're at the low end of the range try a little more. If nothing else you will gain new appreciation for turntable tunability.
You want more? I got more. I got a million of em! More than you have time for I bet! But this will get you started.