Do the culms ever stand straight again after being bent like that for several days?
They do get straight again. I had to tie leaned culms to make them stand straight and after a week, they were OK. I'm not sure if they could do the same thing by themselves. After they lean the first time, you can be 99% sure that they will lean in the same direction the next time snow or heavy rain falls.
After 20+ inches of heavy wet snow back in december that took around 6 weeks to melt, pretty much everything sprang back up. Not as straight as before the snow, alot of my culms have a slight arch now, but not too bad.