Thanks Scott. I’m fairly sure about the AeT/ANT/max HR numbers, and have calculated aet various ways, both in lab and via DFA a1 tests, as well as doing the LT test with blood markers. Former vertical km racer and XC ski racer, so that may have something to do with it.
Will try the drift test again, and see what it says, as well cutting load for a week and see if fatigue is a factor.
Thanks.