Help on Parameter tuning

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Thanks for the awesome work! I used pix2pix in tensorflow and had some good success. I tried the same set of images with your model, however the initial training doesn't seem go as expected.

Below is the model measures;

Since I have only CPU my training times are typically longer(>3 days on 20 cores).

I have set another run with learning rate of 0.00002 for both D & G. Is there any particular hyper-parameter that needs adjustment?

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Update: All my runs with different values of gamma (.3,.5,.7) and lr(.0002,.00002) produce all black images and the measures look just like above...