Sid,
Do you think there was more than 95 litres remaining?
I wouldn't be surprised!
Don't forget, draining fuel from the fwd drain point with the ac in that nose down attitude, even if you drained all that would come out, that would still leave up to 59kgs in the main. So if you want me to put a figure on how much fuel was on the ac, I would say up to the 75kg drained + undrained 59 kgs = 134 kgs.
In conclusion, agreeing with jayteeto's figures, the amount of fuel on the ac at the time was as would be expected, especially using your burn rate.