Young's wine fining problem?!
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From your explanation I can find nothing about your "wine" to bring harm. It may taste a bit strange but the added alcohol is not a problem as long as you keep it ion mind with each serving.
20% ABV will not make it sterile.
I fail to see where the "youngs fining problem" is - it has cleared the wine as it is supposed to (I have no problems at all with it when I use it in my own beer brewing)
Your "wine" is tasting strange because of all the other things you ahve added to it.
It may also be that the grape juice etc you have added has kick started any remnants of yeast in the "wine" and it has started fermenting again ... That will make it taste as if there are bubbles on your tongue.
if you bring it up to 20% alcohol, it would be sterile like listerine.