Maybe i have a clue for the items, i had farm 6 days nothing. On the 7 day a go Helms 2,5 hours nothing so i stand me on helms node and go afk for 1-2 hours. After i come back i go inside and droped the blood under 1 hour. So i go next sulfur, i stand afk at node for a while, after i come back, same here under 1 hour droped the item. After that i go Waragon, gring 1 hour nothing, so i go afk again at node, after i come back 2 items under 1hour, 3 item in the next hour. Maybe i was lucky but maybe the items drop at a specific time, ur at the spot. So if u leave the spot, for repair or bring items to market the time will reset and u never will drop it. i hope u understand what im meaning.