Bass trapping - corners or walls?

I have followed the method outlined in the article above and it worked well for controlling bass resonance issues.  Bass traps place in the corners behind my speakers actually resulted in less ambience eventhough the reflectors were aimed into the room. With the bass traps directly behind me, against the rear wall, brought life back to the room and solved resonant issues.  ASC are expensive but they work.   

I have made four "ASC" type of traps, going by their diagram.  They have helped with general slap back immensely, however, IMO, if you have a bass problem, you will need to go with either a parametric eq, or something besides ASC type devices.  It all depends on your room. Some say any tone controls detract from the sound.  I'm running all analog and even though I have many absorption panels, believe I either need to get a very expensive parametric eq, or make some diaphragmatic absorbers.  I have a problem with  30-150hz.  I've put so many panels of 1" 2x4 703 compressed insulation, I have begun to suck the life out of the music.  I'm going to put some wood facing over about half of my panels and make a couple of diaphragmatic absorbers.  IMO, if you have a heavy bass problem, anything else will be a waste of time and money.  I'm very open to any suggestions.  I have a good quality graphic eq in the mix( Samson S-curve 231), it just doesn't get the job done. My room is 19x21x10 and has 'knee" walls.  I realize tone problem is my room dimensions-too square.  I keep saying I need to post some pics, but don't have a wide angled lens.  Equipment used:  VPI Scoutmaster w/ DRT XV-1s cart, Theta Miles CD transport, Aesthetix Rhea Signature, Aesthetix Calypso Signature, Krell EV-600 monoblocks and a couple of Wilson Maxx II's.  All suggestions welcomed!!  As Milla Jovovich once said "please help."

Has anyone tried one of the major companies I’ve seen advertised that claims their latest traps Are more efficient? I can’t seem to find the ad but it was tas or stereophile.

Also what are the best tri corner traps? I have some old room tune ones that are small but did work when I used them.

GIK Acoustics for the win. Extremely effective, pretty, cost sensitive. Look as well for their soffit traps.

As fate would have it the standing waves associated with room corners do not (rpt not) always manifest precisely in the corners. That’s why it’s a good idea to map out the standing waves using a test tone and SPL meter. You may find in some cases the standing wave is located a foot or more from the actual corner. Placing the tube trap in the precise location of the standing wave makes all the difference. In addition to the corner locations, there usually are other places around the room where a tube trap is beneficial such as at the reflection point on side walls.