what replaced your Aerial 7B speakers?

IF you can get a deal on a used pair of Joseph Audio Pulsars, they do bass and everything else too. But if you like the way the Aerials are voiced, I wouldn't rule out a subwoofer- there are a million of them out there. Another choice would be Von Schweikert speakers or Egglestons
which get piano right. Stay away from super-resolving speakers IMO.
They reveal the wrong cable or the wrong- well everything. Accurate yes.
Pleasant to listen to? Exciting for 30 minutes, then annoying. Again, my opinion. But Aerials are supposed to be pretty great speakers....

I honestly think there's more you don't like than just a bit more low-end. 
I don't want to put words in your mouth, but if you want a speaker with a 12 inch woofer or a facsimile thereof, fine. Get bigger speakers and hope they'll make you happy.  Take a long look at Egglestons, even used ones. 
They sound like music, have had nothing except very positive reviews by everyone, and go down to 19 Hz. If they don't do bass in your room, it's not the fault of your speakers. I had the Andra I and II, previously owned by the guy that sets up demo's all over the world for Wilson Audio ( a long story). He raved about them, also. Andre Previn (RIP) also had a pair. They have other models of course, a bit smaller, too. They are very well made, too- the grills are held on by invisible magnets. I can only recommend speakers I've owned. 

EXCEPT DPM2340 was emphatic- he wants different speakers. Used Egglestons come up frequently and they are killer speakers, with one of the best tweeters ever manufactured, and a crossover designed by A.V. Schweikert. The driver integration is something you have to hear for yourself. They nail pipe organ music in my largely untreated living room.
I would agree the Aerials are more forgiving than some designs and are not something I would get rid of without careful thought, and I would try to audition everything I could. I have echo busters which are pretty good,
but I refuse to take all my pictures down and remove all the furniture.
I tried corner-busters and they looked like hell. One guy I know turns off his refrigerator and his air conditioner (this is Florida), has foam packing from boxes taped to the walls (real snazzy), and turns off the ceiling fan, too. Everything is suspended on little pieces of scrap wood. You can only listen for about 15 minutes before it gets so hot and humid in the room you can't stand it anymore. I have a different approach. I saved up (it took many years) and finally got to a nice level. My tastes are what they are. But when the time comes, I hate to cut corners. So maybe you spend 20% more than you wanted to originally- it might be worthwhile.
I would ALSO say that bass response is not that important, and it's really not. But then I would be hypocritical because I have a lot of pipe organ music.  

Look folks, I will BUY his speakers from him (if he gives me a good price!) because I am confident they sound good. But $4500 is a sizable amount of money, so, not being a psychologist or anything, he wants to make a change. If you bolt the speakers to a SOLID foundation and if there is a back wall behind your head, you will hear tons of bass. I had a similar dream a long time ago. I had an absolutely SUPERB pair of ADS L-810-II on stands and two things were lacking. They had limited dynamic range due to the fragility of the tweeters (they had fuses in the back which would blow to prevent damage), and #2- the bass went down to about 35 Hz. A dealer in town had B&W-801 MATRIX speakers.
The rest is history. But those ADS speakers were gorgeous, covered in real walnut, and they sounded incredible considering they weren't "studio monitors" and all that. You can't buy a pair of 810-II because no one will sell them. So sorry for the long speech, but when it's time to move on, you lose but hopefully you gain, also.