garmin coach vs Training state

Hi there,

I'm following Garmin Coach half Marathon plan (coach Greg, 4/week). I'm in the 3rd week now and I still haven't had anything else then a smooth run. Moreover however, I see the garmin coach is very inconsistent with my Training Status. Just following the coach renders my training state Unproductive. Even more, my VO2max has decreased in the last 3 weeks (only 2 points, but still).

What should I do? Keep following the Garmin Coach, or go about my own and follow the info from Training status?

Hope to learn something from this!

Best