What you say doesnt quite make sense... If a 1600 gram snake is bread she will gain alot more weight lets say 600 grams and use your numbers... thats 2200 pre egg lay. give she will lose some weight from off feed but she shouldn't lose to much so let say she will be 1200 grams post eggs. thats fine... Some of the more reputable breeders sometime breed females at 1400 grams... and I know for a fact by the time she lays and is ready to breed again she can gain more than 420 grams as you say.(If taken care of properly) Those are baby numbers come on.. Not trying to start anything.
But yes they do look small but dont judge a book by its cover people. Stop jumping down peoples throat. Its a turn off to newcomers. Be polite and mature about criticism. Stop acting like kids. Just my two cents.
Keep it up man and dont let the haters bring you down.
People wonder why our community is suffering....
EDIT:
Sorry to single you out Steven! dont all of take this directed towards you! just in general.