Hope this helps..
OK..remember these basic principles....
1 To maintain height/altitude, lift must equal gravity... any difference between the two will result in the aircraft climbing or descending
2 Remember that lift is perpendicular to the lifting surface(s)
3 In a turn, some of the vertical component is lost..we therefore increase AoA to compensate for that loss.
4 The necessary increase in AoA is determined by the angle of bank... thus if the AoA is increased too much, the aircraft will climb.
Cheers, TP