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TooTallTim
What was your HR in that zone compared with old?
You're zones dont just suddenly bump up so it's quite a startle as you're suddenly asking the body to work a lot harder.
I'd re test tbh, it's easy and quick. And go from there.
If your threshold is actually 260 ridingat 230 should be pretty easy.
Re test. See what that says and come back.
Then either take a few days off, if you are tired. Or dial back the numbers a little so you can complete the prescribed sessions. The numbers dont matter, the work does. I've all but given up riding to power. I ride to perceived effort now, and power is whatever it is for the energy system I want to target. And I use HR to confirm where I am.