More elvator and a left rudder to low throttle mix! It is acceptable for the models nose to pitch upwards provided the flight path is level. Kinda like transitioning from straight & level flight into a harrier (but stall instead of add power) without gaining or losing altitude prior to the stall.

Make sure you aren't too nose heavy. If you are, the model will not likely make a clean break. It may just mush over.

Ryan