Best way to farm Force Scrolls?

Im looking for a way how to fast farm Force Scroll. I know larken is the best option for this but hes to hard to solo (i dont use hacks) i did some dim grays but that doesnt seem to work either...is there a better place with higher drop chance of force scrolls? if so out of how many runs to get 1.

i did patrolling and i got it at first time

i did that dual client 1 comp / 1 laptop for 2 hours...each run takes around 5 min so lets say around 20 runs 2 times a char so 40 total total of 4 kobold ES and 7 focused es

i guess its just bad luck.