I'm having about the same experience in flavor development on the Pinot Grigio juice bucket I did in May. One thing is that the "hard edge" is somewhat appropriate to the Pinot Grigio flavor profile. It has a nice acidic slap you in the face flavor at this point. A lot of fruit comes through. Though it finished dry my Mom thought it was off dry, that is either all the fruit coming through or the Opti-white I added at the start of fermentation.
Becoming my wife's go to wine, all but one of the 375 ml bottles are gone (had 10 of them to start).
It will be interesting to see what an overnight in the fridge does to the taste.
Update - good and oaky. But, the assessment that this needs more time still stands.
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