What are your thoughts on asking POIs you've been in touch with for feedback on applications if you haven't been invited to interview? I had a couple of promising back and forths with some POIs but wasn't invited to interview - of course some nice emails aren't a guarantee of anything, but I would like to apply to these people again and it would be helpful to identify any specific areas I could improve...
If you think it's a good idea, when/how would you go about asking for feedback (sooner the better, after people have confirmed acceptances so they're less busy, etc?) / If you think it's a bad idea, why/do you have any other ways of getting specific feedback that isn't from POIs?