On my second fermentation it's slowing down. I've got about 5 more days according to directions (Winexpert Diablo Rojo). If I still see more activity would I go with the idea of no activity or by the reading if my hydrometer reading they recommended?
During fermentation, ALWAYS use your hydrometer as your guide. Everyone's fermentation conditions are different and time varies. Fermentation progress is best measured in Specific Gravity or BRIX, not in time.
As a minimum, during secondary fermentation (fermentation not in a bucket or vat, but in a carboy type vessel), when your hydrometer reading is
both below .998
and doesn't change for about 3 days, you can consider fermentation completed and move on to your next steps.