Image/Stage help

I have a 2012 Volkswagen GTI Autobahn and my system configuration is as follows:
Factory RNS-315 HU
Audison BitOne
Arc Audio 4200SE (front running Hertz MLK2-TW components active)
Arc Audio 4200SE (rear running Hertz MLK2-TW components active)
Arc Audio 2150SE (running RE Audio SEX104 10" sub, sealed 1.1cuft)

All drivers (sans sub) mounted in factory locations. Front tweeters hi-passed @ 2250Hz/12dB Butterworth. Front midbasses band-passed 40Hz @ 12dB Butterworth and 2250Hz @ 12dB Butterworth.
Rear tweeteers band-passed @ 2250Hz/12dB Butterworth and 7kHz @ 12dB Butterworth. Rear midbasses are band-passed 40Hz @ 12dB Butterworth and 2250Hz/12dB Butterworth.
I have tuned and T/A the system and have good timbre and tonal quality but I do not like my stage. I am trying not to have to get into relocating drivers or custom enclosures. Car is a daily driver and I am somewhat spoiled by a set of B&W 802D loudspeakers at home. I am considering losing the rears and maybe going 3-way in the front and building some kind of spherical enclosure in the A-Pillar/Sail Panel area but if I can get what I want with what I have that would be great as I already have a tidy sum tied up in the car already with regard to sound.
Any help would be appreciated and thank you in advance,

Kevin