Hi, do you mean that 5g/L is not enough? As im not using a secondary, im not sure if i can get a totally clean beer just by cold crashing.I just dump my hops in the fermenter and it works great. However, 25 gr hops for 5 liters is a stretch.
My latest IPAs used something like 2-250 gr for 20 liters. They are pungent and real grapefruit bombs. They would not have turned the same with only 100 gr of hops.
Also, I would try to dump the hops in the fermenter. They will soak and most likely settle to the bottom, if not, simply cold crush.
I will try though to tosse the hops directly and see how it goes.