The AI in Mars ore fights is the same AI as in GEx and standalone fights and GvG.
Sometimes it also happens to me that they kill the two steel wardens and don't harm the other units at all. In this case you might want to try:
* start the fight manually, keep the "real" units behind and just move the rouges forward
* use 2 Tesla Walkers + 6 rogues (start manually, keep the Teslas behind in the first round)
* if the opponent has many Sniperbots, and (important!) no Sentinels in either wave, you can use 2 sniperbots + 6 rogues
* if the opponent army comes with 6 sniperbots in the first wave. + 2 sentinels in the first wave, use 2 sentinel + 6 rogues, fight manually, kill the enemy sentinels first, then autobattle. Start second wave manually, keep your sentinels behind in the first round and move your rogues forward, then autobattle.
BTW: my bonuses are 324% / 142% WITH active tavern boost (I have activated it for the GE levels 3 and 4). Normally I don't activate the tavern bonus just for the mars ore battles.
My current status of the battle-relevant GBs is:
* Zeus level 14 (currently @work, will go up to 63)
* Aachen level 13
* CdM level 65
* Terracotta level 10
* Orangery level 49 (currently @work, will go up to 62)
* Kraken level 11
* Alcatraz level 47 (currently @work, will go up to 60)