Zen has a large variance of finding blocks, sometimes translations take a very long time. That's why it's not coin of the future. Also, developers receive 20% of the issue, it is certainly better than Bank, which receives 100%, but still it is not best way.
Scaling and improving of performances will come with BlockDAG
BlockDAG PoW system for mining on the main chain as we have announced many times, is the only real solution to decentralize mining.
IOHK is still working on the BlockDAG study, it is part of the Horizen Road Map. Check Q4.
The BlockDAG implementation will be very complex and complete rewrite of our code so it's a huge project.
It will help solving the problem of centralization of hashing power around mining pools and you will be also able to solo mine.
https://www.horizen.global/roadmap/