So, after arriving at this topic with said problem and fiddling with provided info, I managed to get a satisfactory result with:
G7 settings: Equalizer on Bass Boost, Quad DAC sound preset on Bass and Digital Filter on Slow;
On Poweramp, I disabled the Limiter and zero'd the Pre-Amp.
At least with these settings, coming from a Xperia Z2, felt good enough.