I’ve just used he check volume function, and accepted the suggested increase in volume … but my FTP prediction has dropped slightly. Only 1w. but i was assuming it would lead to an increase in watts. Am I misunderstanding the way it works?
Do you remember what your schedule looked like before the change compared to after?
It just added 15 or 30 mins to some days, but the number of hard days, and days off all stayed the same.
I went back in and reduced the durations to what they were before the check volume.
Ahh. That makes sense. 
Did you prediction change back then?
It did, then went up another watt when I added a zwift race to my calendar. I understand the odd watt up and down is just a rounding issue, but I assumed the “check volume” function was asking TR to “tell me what I need to do to improve faster”.
I agree, and I’d expect that’s how it should work as well.
I’ve shared this case with the team and I’ll follow up when I hear how things are intended to be working.