Recommend a dac that contributes to system for tight bass

@celtic66 +1
I agree with celtic66, the Mystique was a bit of a game changer DAC for me with a more natural sound than the DACs I had before, and a power, fullness, and depth to the bass that reminds me more of real music than I hear from other DACs. I liked it so much my new EVO is scheduled to arrive next week.
However, that said, I still stand by my original answer to your issue:

Add two high quality, powered subwoofers, or a swarm system.

OP, I also have Harbeth 40.2s.  I've tried several DACs/CD players and other components (including Class D amps from my normal Luxman), and the Schiit surprised me that a DAC could make so much difference in the bass department.  No other change in my system has come close to altering the bass like the yggy.  

I own a Chord Qutest on my second system. It replaced a Pro-Ject S series DAC which itself replaced the DAC in a Chromecast Audio. The biggest difference each time I made a change was the increase in bass weight. The Qutest has a really full and solid and tight sounding bass. When I plugged it in I was really taken aback by the increased weight of bass. No doubt in my mind that a dac affects the bass. However I can’t imagine anything with more bass presence than the Qutest as it is almost overpowering at times. So I wonder if your vinyl is giving you more bass than any DAC will do, for whatever reason? Just a thought.

Bricasti M1.  Best sounding DAC in my opinion for the money!

I adjusted my oppo transport by putting it on a solid base and using stillpoints and the bass is fine now....upgraded to lifeatec toslink from bluejean toslink

I still prefer the slightly warmer sound of the playback designs mps5 but it cost 5x as much so the qutest is a great bargain especially for a second system...

For those of you who think qutest has too much bass at times I suggest you fine tune the voltage setting for the qutest when you power it on..

while it depends on your other equipment for me 2v is just right but 1v definitely sounds more open but leaner in midrange and bass.