The p1 needs quite a bit of power for it to shine. Try the balanced out with the bass boost.
It's kind of light in the sub bass region.
Yes i was using my 4.4 balanced to drive P1. 3.5mm really cannot drive P1. P1 need some warm up to sound better. However, even 4.4 wif bass boost didnt really help much in the bass. But wif mojo, it is better than q5s with bass boost. Anyway P1 sound is not to my liking.