What will a preamp do for me?


Missing in the chain below is a preamp - I use the DAC to control volume.  This is my only source and will be for some time.  What could I gain by adding a preamp?

I have Thiel CS 2.3s driven by a BAT VK-55, sourced by PS Audio PW DAC, with bridge II, mostly tidal.  The DAC serves as a preamp in terms of volume control.  Mostly Audioquest cables, amp power cord is Cardas Clear m, all fed by PS Audio upc-200.

I am am hoping to improve the highs, which sometimes sound smeared, too much sibilance; would like more air and clarity.  Loud rock sounds flatter, less dynamic than I’d like.  I am not willing to give up the deep detailed and beautifully resonant mids.  Willing to spend up to $3000, used is ok.  Totally balanced is a must.  Not currently willing to entertain the idea of different speakers - my goal is to make the 2.3s sound as good as reasonably possible before moving on to other speakers.  It’s easy to find a really good preamp in this price range, so much so I am almost paralyzed by the choices.  Aesthetix , Ayre, ARC, several BAT, Parasound and more all have apparently excellent models in my price range.  Patience would put Atma-sphere and PS Audio within reach.  Which is best for my situation?  There’s no way to audition all of these, how could I avoid getting on a preamp merry-go-round?  Or should I spend my money elsewhere?
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And at a guess you would have a 4-250 or 4-1000 drawing more current to warm her up than most use to keep the house warm on a cold night.
@elizabeth The actual answer is in the listening.

Not to take your answer out of context, but - True!
Aside from personal taste, there is a reason why, just because equipment and speakers measure ruler flat on the speck sheet, doesn’t always equate to how they will sound in ones home at the listening position.
First: Our human hearing is not equally sensitive to all frequencies encompassed in the musical/vocal range (in general, 28-16K Hz, excluding harmonics) until the overall sound pressure reaching our ears is about 65db - which is actually moderately loud. If you listen @ levels below 65db (at your listening seat) no mater how good you think your hearing is, no mater how ruler flat your system measures on the spec sheet, both the lows and the highs will be rolled off and is why some pre amps, receivers and integrated amps have Loud or Tone controls.
Second: Regardless of how ruler flat your system measures, every room and it’s aesthetics, will have an impact on how your system sounds.
I am no longer much interested in ruler flat specs, but only what kind of a job everything does together, in my home, to make a musical and engaging performance.....Jim

I'm about to pull the trigger on the Benchmark HPA4 as a linestage and let it do the volume control that has been done by my Benchmark DAC2 HGC, which is feeding a VAC 200iq amp into Sonist speakers.  The system currently sounds great, but most all reports on the HPA4 say it's a definite step up from the HGC in the DAC.  I seem to have a weakness for odd products that claim some special quality, and I find myself curious about the new Linear Tube Audio MicroZOTL preamps.  Anyone want to talk me out of the HPA4 and into the ZOTL?  I suppose I could order both and return the lesser, but I hate returning stuff. Thanks.