Monitor suggestions?

An unexpected, modest budget improvement means I can (possible) address what I perceive as both poorly controlled bass and an overall lack of clarity.  Yes, I realize I raised this before but I think I have a better handle of the problems at this point. 

I suspect the first issue is due to insufficient damping factor on the part of the the Wells Majestic integrated coupled with an inherently difficult-to-control lower range in the Silverline SR17.5 monitors.  

The second issue is most likely due to the dark and somewhat cloudy tonality of the Aqua La Voce 2 DAC. 

I'm looking into upgrading the Wells but here and now, I'd like suggestions on changing speakers. 

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Budget: $3500 (used is fine)

Cabinet: Sealed box or downward firing port. 

Lower extension (ideally) down to 35HZ

Neutral to somewhat cool (but not approaching analytical) tonality 

Placement constraints: Backs of speakers cannot be more than three feet from back wall
and will sit atop 32" stands,(which means no 3-way or otherwise extra-tall cabs).

Listening:

60% acoustic (Jazz, Folkish, Celtic, Singer-songwriter, New Grass)
40% electric (Jam Band, Americana, Blues, Country).
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So far, Elac Vela looks like a possibility.  What else ? 

I plan to assemble an entirely new system within 5 years. I'm just looking to make listening less frustrating for the present.