This thread is like a Jeep, it just doesn't want to drift. Let me try again.
Continuing my wine experiments this year, I pulled small samples from the three batches of mustang grape and the test batch of prickly pear, pasteurized them to kill the active yeasties, and had a taste to see if I should pour them out now or go ahead and let them do their thing. All are passable, one of the Mustang is actually looking very good and the prickly pear is going to send me out for as many more as I can get from that spot when the rest fully ripen. Alcohol content has gotten just past the beer point in just ten days and the yeast is still going full-chooch. I consumed about a full glass between all the samples and had no signs of my usual alcohol allergy, so fingers crossed I can drink some myself and don't have to give all of it away.
So far I've learned that leaving the stems on puts too much tannic acid in the must, washing the grapes takes away the dusty flavor, diluting the juice by more than half turns the strong tartness into a more fruity flavor, and that for mustangs at least it would probably be better to press them and work with just the juice from the beginning rather than using the crushed pulp, seeds, stems, and all. The prickly pear is working out very well fermenting with its seeds, skins and pulp, so I'll let it go all the way to the end of fermentation and its first racking that way. I had to sieve the seeds, stems, and coarse pulp out of the third batch of Mustang today because it's already leaving that green banana feel on the tongue for 20 minutes.