In your opinion, ¿what are the most important new features in the latest Bitcoin v0.16.3 code that we should adopt ? I can think of the faster blockchain initial downloads for one. Or perhaps we should "simply" transfer our features into the BTC v0.16.3 base (our own genesis block, target block time, DGWv3, CEM, 8mPoW, etc.), and be completely up-to-date.
The only feature that I really care about is Segregated Witness because most Lightning Network software relies on it (though it is not strictly necessary for Lightning). The faster syncing and possible DoS/security fixes would be important too. Luckily the current vulnerability being patched for Bitcoin Core 0.14-0.16 (which allows for inflation) does not affect us.