Can I fix that?
It is possible to join it without security using a USB Z-Wave stick. I have done that myself. However, it doesn’t always work well in the long run. In my experience, the best approach is to connect those devices to a C5 and link them to the C7 via Hub Mesh. This is great if you recently upgraded from a C5 to a C7, or have a C5 hub laying around, but not ideal I know...
Note that some devices will provide the ability to connect without security. When a device provides only S0 security, the Hubitat hub cannot disable security. I understand it is required for certification.
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So security is bad...high frequency energy reports are bad...What else should I try to get this fixed?
I just want to have things working again!
Edit: made adjustments, shutdown, disconnected power, lasted about 20 minutes this time.
Security isn't always "bad"--but it can exacerbate problems. S0 security is much more notoriously troublesome as it sends a lot more traffic across the mesh (and is typically used on older/slower devices).
S2 is less troublesome, as it's generally more efficient but, still, many of us have found it to be best reserved for our door locks or other devices that provide some form of security (e.g., say, a light switch where a "double tap" would unlock doors).
About anything that might "spam" the network can be an issue. Temperature/humidity/light sensors are other culprits in addition to energy monitors. I'd guess that judicious use of them with settings such that they don't constantly jabber would be fine (e.g., when the temp changes by 1+ full degrees--but not, say, by .05 degrees 
).
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S0 is bad.. Several packets extra for every packet.. S2 is better but can occasionally miss packets when the nonce needs to be re-synchronized.. I have some stuff in the works to mitigate that..
Yes.. You want to keep this as low as possible for your automations..
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If only I could get off my SO door locks and garage doors for something well below $1k instead of over that.
But, those are all infrequently used devices, in general. I did spring for upgrading my two most used door locks.
I went with Zigbee modules for my Yale YRD256 and have not looked back. For my setup it's been very reliable.
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