I have the same bass node problems in my room (18x13) with SoundLab speakers. A change to electrostatics will not guarantee that your problem will go away. I have a huge peak (13db) at 30 hz and two smaller peaks (6-8db) at 110hz and 250 hz. All the shuffling of speakers and other things in the room only reduced these by a few db at best.
Unfortunately ASC tube traps did not reduce these bass peaks like I had expected. With 5 ASC columns, 6 and 7 feet tall, 11", 13" and 16" diameters, the improvements in the clarity of mids and trebles was very impressive and unexpected...but no luck with the bass.
I then tried a Rives Audio Parc and this allowed me to bring down all 3 peaks; the result was mightily impressive. There was much more clarity again in the mids especially due to the bass no longer being so overpowering. The unfortunate side-effect was a reduction in dynamic contrasts due to the added box and additional set of ICs in the chain.
There is a company here in the Minneapolis metro area that makes acoustic panels with tuneable cavities. I understand these work incredibly well to control bass nodes. This is the next thing I investigate compared to the Parc solution. Send me an email and I will pass on the site to you once I find the brochure at home.