ISO hash oil and low yield

Did the basic frozen alchohol / pot wash
- fill jar, soak 30 seconds , shale 30 seconds pour through filter and let evaporate
used about 3 oz of premium trim and got 3.4 grams of hash oil
very smooth and potent- nice affect , if little flavour (which is what I want)
> thought I should have had a better yield
your insights are appreciated

I shake it the howl time

soak it for an hour

Lol that might be a bad idea. Lol when I make iso hash I soak and shake for 1 min. But when I make RSO with the exact same proses I soak and shake for 2 to 4 minutes tops. The rso is soooooo much darker and harsher if you try to smoke it. Lol but fucks me up for days when i eat it. I've always been told if you soak it to long you pick up to much chlorophyll and plant waxes and it can make you il.

I do it regularly. Im not picky about my extracts. Its about concentrating the THC not so much purifying it.