from w/w CARPET to WOOD floors

Another quick detail. All windows are covered with curtains, but some also have thin ply with egg crate foam stuff glued to it. This is true with the rear windows seen in my photo.
Those absorption panels you see kitty cornered are still there. The four panels I removed yesterday are identical, but were on the side walls. In back of my listening position are several Ikea Expdedit racks full of records. I may take a few baby steps and remove the foam from the ply I have tacked to the window frame. Needless to say, this is a dedicated room(-:

Wolf: Yes- Rigatoni for the rear wall, but I find mixing in some stuffed rigatoni for first reflection is helpful for it's diffusion properties.

Wolf_garcia is right.

If you go with wood or suspended floors, carpeted or not, never spike into them, as you turn the floor into a sound board, which will accentuate and muddy the bass.
Always decouple into suspended floors wood or sheet, only spike into solid cement floors or slabs.

Cheers George

Couple things you could try. How anal are you about turntable setup, when is the last time you adjusted your arm height or checked your VTF. Have you tried any tube rolling?
Best of Luck

I found that covering the front speaker baffles with live sea sponges is a winner, and wall mold, if you're patient and let it grow nice and thick (it can also grow on the pasta), can provide some excellent extra dampening texture along with nice colors.