Hoptiles (hehe) are really solid line holders, they could take the place of pikes in my macedonian setup which goes like this:
1 General used very offensively with the other cav unit
5 Pikes holding front line
4 sword units 2 on each flank just behind and out from the pikes (in your case hoptiles)
4 Archers - they exist to kill enemy archers then shoot targets of opportunity
3 Javs - hold fire most of the battle, then when all units are engaged they flank and throw into the enemys rear, even hoptiles cant stand this from the front so its devastating from the rear
2 units of mercs/AOR usually thracian nutcases with their falx' from the north, usually flank or plug gaps.
1 cav unit usually shock cav, runs around with general wiping archers or ranged units out working with my own archers, then hammer/anvil after javs run out of ammo
Usually enemy would rout half their army when the javs throw, if not or whatever is left the GB and cav finish off, key is to wait until all AI units have engaged you and have lost all cav and ranged support. Javs are terrifying wiping entire units with each volley sometimes, trivializing enemy elite units that are engaged on the front with your pikes/hoptiles (dam i love hop-tiles
). whatever is left or if the enemy stayed strong your cav should finish the job. The amount of ranged support here also helps with horse archer armys, the mercs/aor + javs + cavs with solid front line hoptiles/pikes can literally destroy anything.