Just a thought but....
In deep stalls, T-tailed aircraft suffer from lack of elevator/stab authority due to the wing turbulence spilling back into the horzontal stab airflow.
The nose "chine" may provide a means of offering increased elevator effectiveness in a deep stall by providing "cleaner" air for the stab to work in. (It essentially pushes the disturbed wing turbulence out of the way of the tail allowing a few more degrees of elevator effectiveness than would ordinarily be found.)
PT