If I could make a suggestion?! If you like the N6Pro sound but want better bass, then maybe you should try the Hifiman TWS600. They do in fact have much better bass. It is similar in that it is not totally in your face, but it is much fuller and has some texture to it. They are tuned to be mid forward just like the N6Pro, and they have great detail retrieval. Granted they are AAC or SBC (no AptX), but I can't really hear the difference on these. I think they did the codecs right. The big difference, besides the bass, is that the mids are actually a bit too forwards. I EQ down the 1k and 2k region a bit further than I do with the N6Pro (but you may like them as is). The other thing that makes them attractive is that they are only $50, so you really can't lose.
I would say that those two are very similar in tuning, but the Hifiman is actually a bit cleaner overall, just a bit shouty in the upper mid/lower treble, but certainly not sibilant at all. I believe they do burn-in (or your brain gets used it) and tone down a bit, but if you can't handle it, then just EQ that region down about 3 or 4 db.
These are some of the best fitting TWS I have, and I love the physical button (which is not TOO stiff or TOO soft). I have worn these all day at work and not a single hot-spot. Granted, I ditched the stock tips (which weren't bad per se') for the Final E tips (the regular ones), and they are even more comfortable for me. They also fit into the case with these (and I suspect any stock IEM tips) really well.
Keep in mind that when I say better bass, it is not boomy, nor is it huge amounts in quantity, but it is the quality. It DOES have more quantity too, but it is not all sub-bass, and it is much better controlled. There is good mid and upper bass too. I can hear the snares and all other drums much better on these (which is pretty much a prerequisite nowadays for me, because while I do like some synth bass, I really love analog or real instruments that make those sounds). I wouldn't classify the bass as fast and punchy as planars or even really good dynamics, but for a TWS it is almost an "audiophile" type of bass in its quality.
Anyhow just a suggestion if you like the N6Pro sound!