I agree with you, if you're looking for D2000 bass, the AD2000s don't have it. I'm just reminded how different everyones tastes are every time I come on this site. I feel as though the bass on the AD2000s are sufficient. They are most certainly there, deep and textured for that matter. They might not have a lot of quantity, but the bass is bloody fast, great PRaT.
Once again though, when I heard the D2000s, those had a bit too much bass for my taste, but many others like that much bass. It really is a different strokes for different folks. I haven't heard the W1000 sadly so I can't give you an experience on how they stack up against the AD2000s.
I'm using something close to your setup now for my AD2000s NapalmK. I don't think a tube amp will really let your AD2000s shine, but even WITH the EF2, I get a "WOW" factor every time I listen to female vocals. Don't worry too much on the amp for now, but a nice SS amp like a Dynalo will drive your AD2000s well in the future. The midrange colour may not be to your liking though, so you'll have to give the AD2000s a try, you might end up selling them if the sound signature isn't to your liking.
The lack of bass may be a shock, but the midrange colour maybe even more shocking.Many people seem to be turned off by the AD2000s forward midrange. Personally speaking I don't feel as though the AD2000s is lacking a full, wholesome sound, on the contrary, the AD2000s sound very rich and luscious with a very sweet midrange, but I hardly see many people agreeing with me on this point. I hope you can make some impressions later on for the AD2000s vs. the W1000 as I'm interesting in hearing those as well.
It's always nice to see people with different preferences post impressions.