Need Advice

Eighties Meta

I had this installed as my replacement to the BOSE system in the touring for my 09. The BOSE was supposed to be decent but it bit balls pretty bad this is better but sound still sounds like it all has to come from front and it just isn't LOUD enough for when I want to listen to some stuff really loud. I don't understand how replacing all the speakers (granted only 1 step up from stock speakers) with the new headunit doesn't generate the sound I'm looking for. I'm still stuck in the 80s, lots of 80's metal (Megadeth, metallica, Fates Warning, etc) I want the riff's loud, the bass very audible and I need to feel the drums. what am I missing? Amp? subwoofer? the settings have a cone with front/back and side to side/side settings, if I put it dead center so front/back is equal it's like there is barely any sound, have to shift bias to front which sounds good to a degree but I should be able to hear the bass/drums from the rear I would think but either I forgot to tell them something during install or something ain't right.

Pioneer AVH-P4400BH
Kicker KS 6 1/2 Comps
Kicker KS 4'

at the same time as this I had my backup camera, XM radio, etc stuff done.

I'm confused about where the 6.5 and 4'inch speakers are. Since there are what looks like two in the front dash area, two in the door and two behind the seats. if it isn't a microsoft product unfortunately I don't know jack squat.

any stereo guru's that come to the Columbia car meet?

__________________
2009 370z Touring 7AT/AAM 2.5 true dual exhaust/AAM DE test pipes/z1 vqde35 headers/AAM cold air intake (R-line)/Motordyne M370/Quaife LSD/z1 brake upgd pkg/Swift Spec-R springs/WhiteLine Front&Rear sway bars with endlinks