I cover the PAW 6000’s EQ and ATE functionalities fairly thoroughly on my review:
https://theheadphonelist.com/lotoo-paw-6000-trickling-gold-a-digital-audio-player-review/3
If what you want is to alleviate darkness, you could do it in one of two ways. You could dip the bass between around 100-300Hz with a BPF (band-pass filter) to cut back on some warmth. Or, you could lift frequencies above 8-10kHz with a BPF as well for some added openness and air. But, as always, it’s best to play around and fine-tune it yourself to get the exact sound you’re looking for.
Thank you Deezel177 as always great info and timely to boot!
Always enjoy reading your posts!
Zg1984
Thank you for the kind words!
I can't add much more than what Deezel177 has added above, as I was going to recommend looking at his review and others out there specifically discussing the use of the Parametric EQ on Lotoo devices (you might have to look at a few reviews of the Lotoo Paw Touch Gold also for some hints). The use of a Parametric EQ is one of the nice things about the PAW6000 and the PAW Gold touch.
The other thing you may want to consider, is changing out your cable on the JH Audio.
While not bad stock, you can "tune" the sound via cables also. (Sorry if I'm opening up the war about cables. Will add its IMO and don't expect a cable to change the entire personality of a Headphone/IEM, but I truely believe if close, it can tune in what you are looking for)
I have done that also and for made a world of difference to my Roxanne's and truly enhanced my Jolene's. Not sure what your looking for but there are some great reviews out their for cables, and quite a number of makers do make for the JH Audio 4 pin. For the newer 7pin only a few today but many are committing to make for the 7pin connector (I chose to use the older 4pin connector so I could have a wider choice of cables to use)
But back on topic, I think you will enjoy the synergy of your IEM's with the PAW6000 and its not just with the JH Audio but any other IEM you may move to in the future.
Hopefully like me it will be an investment well made, well at least until Upgradeidis takes hold. Like its been said here on Head-fi. Welcome to Head-Fi, sorry about your wallet