Thanks for playing this long and for such a careful read. The percentage is the press blend. At the turn of winter the press takes every cider apple in the barn and scores how evenly they split between sharp (Sharpwell), sweet (Meadsweet) and bittersweet (Bittermoor). An even three way split scores 100%, and 90% needs the smallest of the three to be about 28% of the pressing. The /30 figures are what each named variety cropped this year, counted at harvest, so apples that were sold or rotted afterwards still count. You never press by hand: once you own the press it runs by itself every winter, you only supply the cider apples. For the wassail only the three cider flavours need balancing; the other varieties just need 30 each in the same year. Fair point about the fruit sold tab slipping out of view, that one is noted.