There's a set of Ixal dailies from Tazel which give you a buff that reduces CP by 100, but makes every recipe lvl 50, as I understand.

Has anyone tried to do a 4 star recipe while under this effect?
Would the loss of 100 CP justify the "extra" quality and progress gained from having the recipe always be 50 instead of 90?

Or does it not let you do 4 stars under that effect?