I recently had the pleasure of listening to the OJAS collaboration with Klipsch, the KO-R1 at my local hifi shop. At low volumes it sounded absolutely amazing with vocal content. Not much below 50 Hz with these as I understand, but if you aren't listening to a lot of pop music or music with sub bass content, these would fit the bill nicely paired with your subwoofers
For those that keep bringing up Fletcher Munson, although this is good information, what people don't account for is the fact that our hearing and our biases for sound at low level can oftentimes incorporate the FM curve automatically as that's how we are used to lower DB music sounding. Although completely accurate, I don't think adjusting to the FM curve always makes sense with "loudness" functions. Lower dB music may have lowered bass etc because of the curve, but the OP may enjoy this perceived lack of low end etc. Just food for thought - maybe the curve is WHY he likes low volume listening.
I second those that are asking about your power conditioning. I have a Gemini 8 from Shunyata and it made a huge difference for low level detail at lower volume. OJAS are $8k or so, Gemini 8 is $2500. $10,500 and enough left over to see an audio specialist about the ears!