Hey Sean
Sorry.. I have to be rusty. Why the 5.5% for obstacle clearance?
Isn't the normal PANS-OPS requirement 2.5% OIS + 0.8% margin, giving a standard 3.3% gradient?
I cannot find the performance tables for SE F5 climbout myself.
As long as you're following published engine failure procedure you have an acceptable margin at MTOW, but I understand that's not the question.
I'm looking forward to see an answer.