@grity
Congratulations at reverse engineering that FDR data, I guess there's no chance of a FOI request for the actual data after all this time - along the lines the 9/11 data some of which is know in public domain.
To cross-check your FPA calc I reckoned the peak climb rate of 6,000ft/min was achieved at CAS of 250kts = 45,000ft/min TAS @ 37,000ft. FPA = asin (6/45) = 7.6 degrees.
Is the difference just my eyes?