Cheap tweaks...What would YOU reccomend?

Not easy to do but:
take out your cross-over circuits
and raplce them with over-lap circuits.
[ any circuit that does not have a cross-over point ]

76doublebass, I've done that with all sorts of cushions including those with shells of nuts in them. I just cannot agree at all. Perhaps they are better than a tv table.

Roll the signal caps. Replace OEM tubes where applicable.

If you have a heavy carpet on wooden floor, remove it and see if that doesn't open up the sound and give better dynamics. Be sure to remove all Sonex you might have lying about. If you happen to have Tube Traps in room corners try experimenting by moving them away from the corners gradually along the wall behind the speakers and see if that doesn't improve things. Make sure the reflective "side" of the Tube Trap faces the center of the room.

I just installed a Pass and Seymour 20 amp MRI grade (i.e. no magnetic materials used) 120v outlet.

To my surprise it made a noticeable difference to the details and sound stage image - mainly due to it clamping the pins of the plug like a vice.

At $25 from Take Five Audio (no affiliation) - a great upgrade and much cheaper than Furutech.