I would definately use them armoured in groups of six, six is so much more mobile than eights. Able to fit through tight gaps, contract to column from expanded fully in one turn, and vice versa. I also prefer cavalry to heavy chariots because they pack nice punch - not as much as the chariots, but are also slightly more manouverable, and can double as evading skirmishers to harass large infantry armies (doubly so as they have a ZOD range, unlike normal skirmishers).
I run my western han as
5x6 units of armoured close combat infantry backed by crossbowmen.
1x6 unit of armoured offensive spear (anti knight unit mostly)
3x4 drilled armoured cavalry (crossbow/sword)
3x4 protected tribal cav (mostly used as rear support, in column, for the medium infantry, in the impact phase, and then doubling up as extra units to whip around the flank, once the medium foot survive the impact).
Basically the main fight for medium foot against most armies is surviving the impact phase, since most troops will have the plusses in the impact phase, so with rear support + an IC, you can try to stagger the charge and keep units alive during the impact phase. Don't put the IC into the front lines, just have him zipping around to whichever unit needs the +2 modifier to their cohesion for the turn. If a unit breaks, the tribal cav behind the front lines should be able to harass/hit whichever unit pushes through, in the flanks, expecially when the medium foot in groups of sixes, meaning that its more likely for the enemy to be fighting more than one unit at once... meaning that they will be held in place for a flank charge by the tribal cav/another unit of med foot.
Lastly, another benefit to having them in sixes is that you get more units, so your army is bigger

.