If you are programming yourself, Kurt and I were talking about "way over’-unders (criss-cross intervals) over here: How do I get better at 1-3min power in the middle of threshold/sweetspot/tempo, aka avoid getting dropped on zwift race climbs? - #17 by WindWarrior
May not work for you, but these have been gold for me. So much better than steady tempo or sweet spot.
And apologies for my earlier comment, Coach Cusick’s masters ilevel plan puts the PD curve unstructured testing in the first week after a recovery week.