The paper and codebase do not modify Bitcoin's difficulty adjustment algorithm. I think that in the early days of a new protocol the hash rate may vary significantly and therefore Bitcoin's difficulty adjustment algorithm is too slow to react.

I've opened a github issue to discuss it and following the response submitted a PR to the codebase that integrates @zawy12 LWMA algorithm.

I'll appreciate your feedback and support in adding the LWMA algorithm, which I think should also be used in the testnet

* https://github.com/bitcoinroyale/whitepaper/issues/17
* https://github.com/bitcoinroyale/bitcoinroyale/pull/1