These dimensions are actually better. Your Bonello modes / third ascendency is now full (rather than missing one step) and now most of your bass modes fall squarely between notes with fewer needing attention.
Outboard crossovers will be available as plans or kits or finished products - in due time. Not yet. We'll also be offering an internal (significant) upgrade where the XO remains inboard but moves from behind the woofer to the cabinet bottom. Not yet ready for prime time.
Yes, tunable traps will address your bass mode issues. But I have a bigger problem with subwoofers, which was shared by Jim, but practically unavoidable in the Home Theater milieu. Short rant:
The ear-brain does a fine job of providing phantom fundamentals. When the harmonic structure suggests missing lower partials, we just make them up. Of course it's better to get them actually heard. However, when a subwoofer supplies the fundamentals, they are typically a full cycle behind the upper partials of the sound package. Depending on the cross-point, let's say it's like the lowest portion of the sound emanates from 20 to 50' behind the sonic image. I surmise that a larger than average segment of the Thiel population is tuned into the time element of music. As such, we, and I speak for myself, can find this delayed bass less than satisfying. The 2.2 is reflex bass, which does that bass delay crossover at 45Hz. Subwoofer crosspoint might be tried there for no further time-domain harm. A sealed sub (such as Thiel's own) reproduces all the way down with no additional phase rotation in the deep bass.
