Probably getting different speakers would do a lot more for you than getting a different amp...
Surely the amp is important, but if your speakers lack bass extension and resolution at low levels then no amp is going to fix that. The room could also be part of the problem, but to know that you'd need to try a few different "known" speakers in the same location as your present speakers. Maybe you could borrow a set of speakers just to check that possibility.
I'm using Energy C-7s as mains in my HT system and I'm very happy with their resolution at all levels and they have very good bass extension and articulation.
Surely the amp is important, but if your speakers lack bass extension and resolution at low levels then no amp is going to fix that. The room could also be part of the problem, but to know that you'd need to try a few different "known" speakers in the same location as your present speakers. Maybe you could borrow a set of speakers just to check that possibility.
I'm using Energy C-7s as mains in my HT system and I'm very happy with their resolution at all levels and they have very good bass extension and articulation.