My room has "zero" slap echo. Do I need room treatments?

Thank you for your suggestions.  My ceiling has wood beams as well and is probably helping as you suggested and I have a tall silk plant (8') in the front wall corner.  Hope it is helping as well.  Thanks tom6897.

The left wall is all glass with full length vertical blinds.  I have put a tall backed upholstered chair at the reflection point.  Thanks mijostyn.

I am going to try some diffusion behind the speakers on the front wall.  Should they be placed in same manner as you would place absorbers?  IE where the reflection point would be.  Thanks bkeske

Forgot that you asked about the bass.  I just added two JL Audio E112's to the room and it is incredible what they have done to my whole system's SQ.  As I said above I have a large and very irregular room and needed these subs to pressurize the room to get better sound.  Very happy with the bass.

Thanks for your responses.  To clarify about my room... the horizontal log walls are flat on the inside except for a 1" miter cut at the top and bottom ( so there is about 6" of flat surface and a 2" groove).  If you bang the side of your fist against the wall all you get is a sore fist.  It's really dead sounding.  However, I have seen some log home systems with rounded logs on the inside that would help diffusion and some "post and beam" that were rounded on the vertical.  So, what would work best behind my speakers?

Thanks, I do have the Stereophile test CD's and an SPL meter so I will do my best.