If the walls of your basement are not properly treated, than chances are that a
basis software kit will not be very helpful. Low waves have no problem
traveling through walls and the interference pattern you get in your room is
determined also by wave reflected by walls of the neighboring rooms.
Consequently, your four walls are not equivalent. Most basic software
packages assume they are equivalent.
If possible, place the speakers against each wall. You will be surprised how
dramatic the bass will change when moving the speakers form one wall to
another. If you have a dedicated stereo room, why not position the speakers
and listening chair to maximize the sound.
Electronic equalization can improve the bass response, stereo image and
sound stage considerably. Also, tame down (or kill) the resonance you have at
65Hz. However, electronic equalization should be done only in the last step,
i.e. after everything else was carefully optimized. As you suspect, hoping to
solve the problems of bad speaker placement with electronic equalization will
only suck out the life from the music.
I had a similar problem a year ago. Now I have a very good sounding room. :)
Good luck and keep us posted!