Hi there,
I'm glad that you are getting the environment slowly optimized up to boot. The thing that should be done next is actually pinpointing all the orange VMs and getting us their:
- process explorer sorted by CPU usage
- esxtop of the ESXi the machines run on - it seems that in this case there'd be only two ESXi hosts requiring further investigation
also if you can try to get in touch with their users as to confirm what all suits their needs.
Good luck!