It might be down to the genes too. You said you bought them in so suggest you try a source next year. I've hatched my first goslings this year and the only one I lost was one that I struggled to hatch and he clearly had a leg problem from the outset which the vet confirmed could not be treated so he was humanely dispatched. My goose book does say they can be tricky to rear but like the others I've had no problem. To be fair, six were with a broody hen so she did the hard work, one went into school to live with some newly hatched ducklings in reception class and two went to friends who wanted some small creatures to coo over. So I only really took responsibility when they were feathered up and self sufficient!
As to shutting them up at night, easy to herd but never likely to go in by themselves (unlike the ducks which do eventually head indoors).
H