Scott - I am big on Jadis - and have owned many of thier masterpieces in my life, congratulations on picking the beutifull sounding JA30s!
Maybe I missed the preamp make on your system listing, but a Jadis preamp will help a lot in having your Jadis amps working more linear and less stressed, I have been nto the no-preamp route and passive options but ended up again using a preamp in the audio chain due to the better dynamics, tonality and musicality they bring.
One last word - I just bought a Velodyne DD18 sub and ended up placing it as close to a corner as possible (it is also Velodyne's own recommendation BTW) - I see yours almost in the middle of your setup - have you tried different positions?
Congratulations again!
Fernando