ColdFusion 2016 Installation, resolve issues with Cluster over 10 CF instances

Must have experience of running ColdFusion 2016 Cluster successfully on Windows 2012 R2. I have successfully installed ColdFusion 2016 64-Bit on a new Windows 2012 R2 server that has 128GB Ram running IIS 8.5, we had planned to run 30+ CF instances in a single cluster. However once I get above 10 CF instances (single server) in the cluster I am unable to access any pages. Also CF 2016 is a lot slower than our existing 9.0.1 server, example reference page 563ms (CF 9.0.1 Cluster) against 1,713ms (CF 2016 Cluster) Looking for someone who can help resolve the issues with increasing CF instances in a cluster without it falling over, also increasing tuning so that performance matches existing CF 9.0.1 installation.