Oh, my… I hope everything’s fine considering.
Sorry it’s taken us so long to get back at you.
The defaults are usually okay.
Can you please try purging (sudo rm /var/APM/ArduCopter.stg) parameters and try recalibrating outside once again?
If it yields nothing, I suggest a new ArduCopter-3.5. Here are the details. Purging parameters is also a good idea before proceeding.