Also yes I did set all the distances.
What version of this sub do you have? It is used so we need to know. The current version is a ported sub with an F3 of 30 Hz. It is in a box of around 1 cu.ft internally, which I suspect is too small.
The earlier version was not only sealed but an acoustic suspension design. This type of design is not only sealed but uses a high Q driver with a very floppy suspension and the entire restoring force comes from the air in the box. This is a bad design and if you have that it explains why all you get is boom. I did note that a reviewer said this sub was easily driven into frequency doubling.
I would say your room dimensions are satisfactory. In addition unless the wood paneling is fastened to sheet rock, that type of construction is bass loosing and not boomy.
I would say you probably have a sub it is impossible to live with, especially if it that acoustic suspension horror.