I brew 23 litre batches all the time, when i use 3 kg's of lme it is usually in the neighbor hood of 1040 i take a reading and adjust Then I add approx 1.25 lbs DME with about .5 lbs dextrose (to get to 1050). Something is really weird here it sounds like he has put in 2 cans at 1.5 kg or 3.3...