Jo it's okay
One book said 18 -23kgs and 10kgs is just the amniotic fluid -plus the extra plasma volume -

I guess being busy will help - you might not need trips to the gym

They say BF helps with weight loss - feed two twice the bonus
I read your other post - you could always express for the other twin alternate feeds. MY DH is keen to bottle feed - while I feed one when he is home (middle of night too if I am lucky) - Dad might like some bonding time too.

the foam sounds a good idea - need to get pics. Did your hospital just have special twin class - how many people were there ?