As with all rules, there are a few exceptions.
The H46 (and maybe the Chinook) isn't concerned with aft clearance during aerodynamic braking, within reason. The benefits of aerodynamic braking are more to do with keeping the wheel brakes cool. Although at the higher speeds, aerodynamic is much more effective even after an engine failure.
BTW Nick, congrats on the new position. I'm sure you'll enjoy it there and will establish yourself in biz jets like you have in helicopters.