From teaching multi engine, we used climb power of 25/25 and never took the stall to the break. Again, this was only for commerical, from a private multi stand point, I am not sure what power would be appropriate. At 25/25 the nose is pretty well up there. I would not mind doing it at full power, but come on, what if one of those tiny piston engines gives at that pitch at a very low airspeed well below vmc? It is going to be a BAD day!