PDT- And Fell Cleve

ok, me and a couple friends is gearing up for a empy static. we plan to KI farm for cloris and glavoids.
i don't see much of any guides to PDT fell-cleaveing

so far i only have 28%

but when i finish my set i will have around
39%
(unless i feel like spending mindless days working on the +1-2% darkness earrings)
which even than id be around 41-43%

is 39% enough?
how much is too much if that's possible?

i know 50% is cap, what i mean is how much is enough to effectively do
fell-cleve farming