I tend to smack the AI pretty good in battles on hard, but the only heroic victory I've achieved since the patch was playing as Date when I sent a ~10 - 12 high quality units to invade Sato. I had 900 high quality (katana and no-dachi and bow samurai with some leavening from yari ashis) with a pair of generals against 1700 ashis with 3 or four generals. I sat on a hill because I was attacked after disembarking, and then launched a downhill charge that gutted the Sato army like a fish (it helped the daft AI kept half of their yari ashis sitting uselessly a few hundred meters behind the action), killed their generals and the route was on. I lost ~150 and killed >1500 of the AI army (I needed more cav!).
Immediately after that battle Sato threw their 1200 man army that had been sitting in the capital at my now ~750 man army, and I did the same thing, but no heroic victory.
They're tough to get and I think it has most to do with the balance of power initially.
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