My understanding is:
Max Angle is Max Climb: ie Vmin+5.
Max rate is allegedly CI 0 (although my hunch is that it is less than that). Max endurance is min drag, max excess power, which would better fit the bill for best rate of climb.
Max endurance is min drag=min thrust on a jet, on a prop however it is min power which isn't necessarily the same.
Min drag on a jet is not the same speed for best rate