well i do not know ur controller so i don't know how to tell u if u can reverse he pan and tilt channels on ur controller cause the dj scans to my knowledge don' have it avail as a function within the unit itself. but it can be achieved through the dmx controller. if u could send a link to the manual for ur controller i may be able to help u out. cause the 4 on each side thing would require one side to be norm. pan/tilt and the other would be reversed pan/tilt. as far as using a group of faders u can select each fixture button u want to control (i think, not sure cause i don't know ur controller) and al those fixtures given they are all the same type of unit will move in synch to ur faders.
now on ur set up: what dos ur rig look like? what trussing do u have? answer that and i can help some more. peace! jingles!!