Personally, I think if the OP is saying they they are struggling to stay below 200%ftp on intervals that is enough grounds to doubt the FTP setting - not saying that it’s definitely wrong - but enough to be suspicious.
More importantly for me is the fact that currently adaptive training does not take into account manual increases in intensity - so with the OP ranking that workout “moderate” they won’t be dished out a harder workout next time.
All that being said, I just looked at “grassy ridge -3” (which is the PL 1.6 workout the OP seems to have done)… It does look very very easy in its unadjusted form… might not be the best workout to gauge fitness on?