I would guess that most people struggle at some point on AFF.
I recently completed my AFF
There I was practising reserve drills over and over... but the upshot- no problems on morning refreshers
My exits and lack of arching were what affected my confidence.
Level 3, I nearly flipped myself and 2 instructors on our backs.
Level 4, I did flip myself and instructor, couldn't get back stable and got pulled at 9500ft
Level 4 repeat, flipped on exit again, but now learnt to get stable
there is progression and things to be learnt from problems.
I now have no problem getting stable again, due to being unstable many times...
oh and I would say it was only on my consols when finally I could just exit stable properly with confidence
keep positive, if you don't give up, then your not failing anything