well.. i think you did alright.. you used alright trim (not the best right?), and so out of about 15 and a quarter oz. you got 40 grams of the finest physical matter on the weed plant?
that aint bad, i mean i would not prefer to do these runs(yet is still do every now and then) , but hey, say you had something fresh, and smelled good, 40 grams of that is superb to smoke..
now if it was nasty really really old, and mixed, the choice to BHO it should be heavily thought of before hand
but none the less you did it. compare 2.6 grams of the bho you just made to 1 oz of the trim you just used.. which would you prefer? i'd like to see some pics as well!
i feel no matter what, if you got over 2 grams out of an oz, its not completely wasteful.. but if you got anything lower, screw it!
i would not try to re run this stuff though, onto the next batch!
you just need better material my friend, i feel your results match something that i would get as well..