Ok we did some quick test now with another R01F resistor (don't try this at home please unless you're experienced in SMT soldering).
This will void your warranty! By changing the resistor to 2.2k gives us 0V74 Vcore. This will push the hashrate up a bit and support higher clocks. We will run a production batch with this resistor to try to bring the cards within spec.
Fans are highly recommended in anything but polar regions 
Meanwhile full sized miner is falling quite a bit short (10-20%) on hashrate, but the powerconsumption is.... 250W AT THE WALL.