I’m very new to TR (4 weeks). I came from about 10 hours per week training load and went with a Masters Gran Fondo, High volume plan. Had a similar result to yours but I only have 2 ‘hard’ days during the week. The TR staff recommended allowing/accepting the adaptations to play out. It is frustrating to not be getting the long Z2 rides I really enjoy, but my plan has begun to adapt and the Z2 rides are beginning to lengthen slowly week over week. I think for me at least, patience is the answer.
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For easy endurance rides, just ride for however long you wish to and can recover from such that you can still hit your (2 in your case) key workouts hard.
These plans are not scripture, to be followed religiously, particularly so for the easy/endurance stuff, but I seem to be seeing quite a few posts from people who seem to be treating them this way…
There are many use-cases where manual intervention - choosing a different workout from the one scheduled - can be the most sensible thing to do, so long as it’s done wisely and in accordance with an understanding of your capabilities and with you listening to your body, especially so for those with plenty of prior training experience who’ve developed their own “internal guardrails” to prevent them doing silly things.
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YESSSSS TO ALL OF THIS 
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