Not sure about the the bogies. Two opposing factors at work:
1. Which brake set can apply the most pressure without skidding. Possibly the front set as the CG rotates around the gear. Probably only applicable with anti-skid working.
2. Which brake set can dissipate its heat the fastest. Also probably the front set since it's in clean airflow & not shielded by an axle set.
Without further data I tend towards rear brakes getting hotter.
AoA is normally controlled using the elevators to change pitch attitude with a resulting effect on AoA.
Other devices can also affect AoA eg flaps. AoA is defined as the angle between relative airflow & chord. Since the chord line is a straight line connecting leading & trailing edges, a change in the relative position of these gives a different AoA.
This ignores any further effects as the equilibrium of forces is regained.
Counter rotating props don't have a critical engine. That's why they're used.
I wouldn't expect contra rotating props to have a critical engine UNLESS there's some interaction between front & rear propellors that skews the thrust line.