I've been using my 4★ Stark Spidey, starting off playing chicken to get my poise charges up to 7 or 8(the other 3 will come naturally from him auto-dodging the specials), and then 1 or 2 of his L2's completely scorches their life-bar (it has double damage on robots)
More than anything obviously try and get your class advantage against whichever class the Senti is, make sure to read that particular classes abilities, because they change from the standard Tech Senti, and start bringing a champ with Shock Damage Debuffs
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will try tomorrow