we did a lot of our early experimentation with small networks. I don't think we went any smaller than 5 layers of 64 filters as we mentioned here: https://medium.com/oracledevs/lessons-from-alpha-zero-part-5...
For example: did you notice than increasing or decreasing network size required significant changes in other hyperparameters? Are small networks learning faster at the beginning of training before they start to plateau?