Don't know of the extent of 'it's bent'...but it wasn't 'straight' in the first place (when you took it apart). It being a fairly long soft spring with nothing guiding it except the throttle cable through the middle (which amounts to no guide at all), it's easy for it to look a bit wonky.
Maybe take the carb out of the boots and see if the slide is coming down as far as it should. Obviously not with no return on the grip..but while looking at it and maybe with a bit of 'digital' intervention (try moving it with your finger ;) ) you will be able to see what's up.
The only thing that would keep your slide 'up' after a throttle twist is some sort of obstruction. Maybe some dirt/crud got in?
Can't have that!
Here's a thought. Was the needle (not for the main by the way...but for the needle jet) kinda sloppy after you put the retainer back on? It should be...should easily wiggle around. If it is 'stiff', something is wrong there. It could be hanging up in the needle jet.
Can't have that, either.
That wouldn't have anything to do with hearing the spring...maybe those two things are separate issues.
You didn't happen to use something other than the OEM clip, did you?
Hope you post the fix.
Good luck!