Thanks for the well detail inputs. Hard subject I guess.
Yes, I was concerned on your point b.
Understand the whole concept about BFL data and yes I know about poor AFM data sometimes. Guess it depends how much you pay for the plane...
For the long calculation, that's why my company is using an external performance provider. It relieves the pain that you just mentioned.
Still one thing to ask. Where did you get this V1 related to 1.05 VMCG?.
I thought V1 was established in relation to VEF (VEF not less than VMCG) with a time delay of 1 or 2 seconds depending on cetification prior to or after FAA amendment 25-42.
Rgds.