they all work mate, the only difference in the angle is.... well..... the angle it comes out at.
i was filling the drum right up, hence the initial angle, but my findings are that with the shallower angle, you can fit more oil in the drum, but i would reccomend either a collar on the top, or the nozzle setting deep in the drum.
with the steeper angle, you dont get as much "lift", but the fan isnt as long, due to the angle. (it hits the oil in the drum).
i will make a few vids tomorrow and show the differences.