Man you gotta fix that ~70hz dip of 20dB!!! RIght in the kick drum wheelhouse. That frequency should be alive and well on the ported caps!Have you tried changing the driver facing orientation? Distance from wall, ect. That's a big hit on music sound in my experience.
We recently had a similar problem with bluesprings1's ported caps.
The solution in his case was actually moving his listening position three feet forward, which doesn't sound like would work for you - - - but I'd recommend trying whatever you can to fix that big null at your listening position! I bet your opinion on the subs would jump quite a bit when you get that strong kick drum in play!
I believe the dip is related to the floor to ceiling distance, as I read about on bosso's website. moving the listening position is not an option, and the subs are fixed as well. I tried playing with delay, but it didn't work. I'll see if I can change their orientation. Asides from that dip, response looks pretty good right?