Actually it's completely normal. It's all about thick wings.
In a slow speed climb :
Thicker airfoil -> less AoA -> less drag - > higher climb rate for a given horizontal speed.
You need to spiral up to get away with the 109 or the hurri will catch you.
As a side note, Hurri with boost cut out can be slightly over modeled in certain situation. You need to be keep yourself alerted in that situation. Anyway if you are in the front sector of any opponents, it's time to have a close look at what you are doing
