So, let me get this straight:
Engine failure w/ F30 = stay at F30.
Engine failure w/ F40 = F15.
I'd think that climb perf on a SE G/A from F30--->F15, etc would be worse than starting at F40, reset to F15 and then on the G/A F1.
Actually, now that leads me to another question. If you went around from F30 on a SE G/A, would you go F30>F15>F1>Fup, or F30>F15>F5>F1>Fup. . .