If you are using RFu_jeelib, that was derived from JeeLib many years ago, in 2013, so it should not be having the same problems that new users are seeing.
So before I go any further, can I check what you want to do:
You want to use the continuous monitoring library on an emonTx V3.2 that’s fitted with the RFμ radio module. Is that correct?
I do have an emonTx V3.2, I am almost certain that I tested emonLibCM on it, but with the demonstration sketch that comes with the library, rather than with the GitHub “EmonTxV3CM” sketch. I shall go back to it and test again.
At the present time, I’m testing a V3.4 with a simplified version of that sketch and it has sent more than 875000 messages (at one per second) without a problem. If that runs on the V3.2, you might want to try that.