holding Auloncara Eurekas

my two eureka red girls are holding again, last time I stripped them after
about 30 days, the fish were definately developped to the point that they
were like little copies of their mum, with no egg sack at all. problem is
when I put them into the bucket full of freshly obtained tank water, some of
them came out dead, some of them came out not moving, kind of limp, just
resting on the bottom of the bucket, or kind of stuck in the surface tension
on the edge of the bucket. they all died in a few hours.

maybe I have some very inbred parents and the fish are coming out retarded?

maybe I will strip earlier next time?

any ideas appreciated.