I did the A320 after 5000 hours in various stick and rudder jet aircraft... I had a step learning curve as well... I sat my arse down and learned the philosophy of the Airbus (which was not easy also) and then I stopped fighting the airplane in the simulator. Then it clicked, and once it did the Airbus is really a great plane.
My best advise is to really listen to the instructors.
V1 cuts and transitioning from autopilot to hand flying single engine was where I was having problems. I also had never flown an aircraft with auto thrust either.
I would sit down with your employer and be totally honest, and don't blame anything or anyone but yourself... In my years I've noticed people with good attitudes and willingness to learn and not make excuses will go a long way.
I'm not saying your making excuses, I'm just passing along some advice I got many moons ago.
Good luck