Eeehh? Just did as the Antminer user guide adviced, replaced (manually with pretty small soldering iron) the stock 1kOhm SMD resistor with 10kOhm and added second 3.9kOhm resistor parallel to first.
Stuck a bigger heatsink into it with thermal epoxy, which was leftover from my GPU tuning project.
Started bfgminer and set the hash frequency to 2.6 (miner didn't start with higher freq.) with --set-device antminer:clock=x4c81 command.

Currently have total of 3 more Ants ordered and planning to make a small 4 Ant farm, aiming for total hashing power of 12Gh...