With such small amount of medium , they bottomed and went and flowered way before they set up any kind of rootmass ... What you see is ALL all you are gonna get. No matter how much light you throw at it , they are done . Autos are a no brainer , once you pop them you can't stop them , so ANY screw up kills the potential of them.
Even after you dry those out , most of the weight will disappear and be even sadder.
6 weeks in flower , they should be way more ahead than that.
" Actual " flowering time occurs around day 35-40 from seed as plant sexes and preflowers. So I am not sure if you meaning 6 weeks from seed. Anyways , the lack of medium space is what kept them small and stunted.