Thanks, that really lines up with my experience and what I've been told by those who work in the industry - which is the most you can 'lift' a wine is one level; i.e. if you have average grapes you can make a good wine, if you have good grapes you can make a great wine, etc.
I like your...
I have only done a few very small batches at home, but I had a similar experience in terms of my first vintage the grapes were really good so I got quite a good result.
My next batch was a fair step down in terms of quality of grapes (from the same vineyard), and the wine wasn't as good even...
It's been a hot season in Perth for grapes, if you don't mind me asking Obelix where do you source your grapes from here?
I do even smaller batches (~40kg) and often find it difficult to find consistently good grapes, I have one good supplier in Swan Valley and the remainder is always random...