Are these EPCCTX0X systems 8vCPU systems - they look like it. Above you said they are 4 vCPU.
Either way, these RDY times aren't bad. You have to remember that %RDY is the aggregate of all the combined vCPUs in the system. So if you see 20% RDY on a 4vCPU system, each one is only 5%, which is a reasonably healthy number. If these are 8vCPU, you are at 2.5%, which is perfectly healthy....